回答編集履歴
2
指定した分割数で 1つだけ表示するコードを追加
test
CHANGED
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@@ -311,3 +311,75 @@
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311
311
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{2} {1} {4} {5} {6} {3}
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312
312
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313
313
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```
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314
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315
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**追記2**
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316
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317
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分割の全パターンを表示するのではなく、
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318
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319
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指定した分割数で 1つだけ表示するようにしてみました。
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320
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321
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```C
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322
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323
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#include <stdio.h> // printf, putchar
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324
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325
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#include <stdlib.h> // rand
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326
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327
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328
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329
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#define N 12
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330
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331
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332
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333
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void print(const int a[], int i, int j)
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334
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335
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{
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336
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337
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printf(" {%d", a[i]);
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338
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339
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while (++i < j) printf(",%d", a[i]);
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340
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341
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putchar('}');
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342
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343
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}
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344
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345
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346
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347
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void divide(const int a[], int n)
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348
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349
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{
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350
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351
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int i = 0;
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352
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353
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for (int k; --n > 0; i += k) {
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354
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355
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k = rand() % (N - i - n) + 1;
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356
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357
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print(a, i, i + k);
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358
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359
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}
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360
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361
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print(a, i, N);
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362
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363
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putchar('\n');
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364
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365
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}
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366
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367
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368
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369
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int main(void)
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370
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371
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{
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372
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373
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int a[N];
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374
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375
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for (int i = 0; i < N; i++) a[i] = i + 1;
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376
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377
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divide(a, 3);
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378
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379
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divide(a, 2);
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380
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381
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}
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382
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383
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```
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384
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385
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配列をグローバル変数ではなく、関数の引数にしました。
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1
別解
test
CHANGED
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@@ -143,3 +143,171 @@
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143
143
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{2,1,4,5,6,3}
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144
144
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```
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146
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**追記**
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148
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149
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何分割するかで分類してみました。
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150
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151
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```C
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152
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153
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#include <stdio.h> // printf, putchar
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154
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155
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#include <stdlib.h> // rand
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156
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157
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158
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159
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#define N 6
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160
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161
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162
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163
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int a[N], p[N];
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164
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165
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166
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167
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void divide(int n)
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168
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169
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{
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170
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171
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if (n == 1) {
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172
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173
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for (int i = 0; ; i++) {
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174
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175
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int j = p[i], k = p[i+1];
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176
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177
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printf(" {%d", a[j]);
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178
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179
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while (++j < k) printf(",%d", a[j]);
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180
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181
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putchar('}');
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182
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183
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if (j == N) break;
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184
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185
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}
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186
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187
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putchar('\n');
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188
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189
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return;
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190
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191
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}
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192
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193
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for (int m = 1; ; m++) {
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194
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195
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p[n-1] = p[n] - m;
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196
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197
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if (p[n-1] <= 0) break;
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198
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199
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divide(n-1);
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200
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201
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}
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202
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203
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}
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204
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205
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206
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207
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int main(void)
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208
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209
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{
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210
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211
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for (int i = 0; i < N; i++) a[i] = i + 1;
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212
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213
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for (int i = 0; i < N; i++) {
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214
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215
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int r = rand() % N;
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216
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217
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int t = a[r]; a[r] = a[i]; a[i] = t;
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218
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219
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}
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220
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221
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for (int i = 1; i <= N; i++) {
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222
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223
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printf("--- %d ---\n", i);
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224
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225
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p[i] = N;
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226
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227
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divide(i);
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228
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229
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}
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230
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231
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}
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232
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233
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```
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234
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235
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```text
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236
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237
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--- 1 ---
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238
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239
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{2,1,4,5,6,3}
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240
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241
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--- 2 ---
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242
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243
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{2,1,4,5,6} {3}
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244
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245
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{2,1,4,5} {6,3}
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246
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+
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247
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{2,1,4} {5,6,3}
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248
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249
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{2,1} {4,5,6,3}
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250
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251
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{2} {1,4,5,6,3}
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252
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253
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--- 3 ---
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254
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255
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{2,1,4,5} {6} {3}
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256
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257
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{2,1,4} {5,6} {3}
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258
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259
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{2,1} {4,5,6} {3}
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260
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261
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{2} {1,4,5,6} {3}
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262
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+
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263
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{2,1,4} {5} {6,3}
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264
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+
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265
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{2,1} {4,5} {6,3}
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266
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+
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267
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{2} {1,4,5} {6,3}
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268
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+
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269
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{2,1} {4} {5,6,3}
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270
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+
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271
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{2} {1,4} {5,6,3}
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272
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+
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273
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{2} {1} {4,5,6,3}
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274
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275
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--- 4 ---
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276
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+
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277
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{2,1,4} {5} {6} {3}
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278
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279
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{2,1} {4,5} {6} {3}
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280
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+
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281
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{2} {1,4,5} {6} {3}
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282
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+
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283
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{2,1} {4} {5,6} {3}
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284
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+
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285
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{2} {1,4} {5,6} {3}
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286
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+
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287
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{2} {1} {4,5,6} {3}
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288
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+
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289
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{2,1} {4} {5} {6,3}
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290
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+
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291
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{2} {1,4} {5} {6,3}
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292
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+
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293
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+
{2} {1} {4,5} {6,3}
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294
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+
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295
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{2} {1} {4} {5,6,3}
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296
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+
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297
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--- 5 ---
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298
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+
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299
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{2,1} {4} {5} {6} {3}
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300
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+
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301
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+
{2} {1,4} {5} {6} {3}
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302
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+
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303
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+
{2} {1} {4,5} {6} {3}
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304
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+
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305
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{2} {1} {4} {5,6} {3}
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306
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+
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307
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{2} {1} {4} {5} {6,3}
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308
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+
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309
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--- 6 ---
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310
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+
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311
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{2} {1} {4} {5} {6} {3}
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312
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+
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313
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+
```
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