回答編集履歴
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msvc
test
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- [random_shuffle - cpprefjp C++日本語リファレンス](https://cpprefjp.github.io/reference/algorithm/random_shuffle.html)
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- [uniform_int_distribution - cpprefjp C++日本語リファレンス](https://cpprefjp.github.io/reference/random/uniform_int_distribution.html)
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---
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まあせっかくなので、rand()の性能が悪いことで有名なMSVCでもcateyeさんのコードを実験してみました。
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```cpp
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#include <iostream>
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#include <cstdlib>
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#include <random>
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//
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using std::cout;
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using std::endl;
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//
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const int R_MAX = 1000000;
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int main(void)
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{
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int rr[4] = { 0 };
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int mr[4] = { 0 };
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for (int i = 0; i < R_MAX; ++i) {
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rr[(rand() >> 7) % 3]++;
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}
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//
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std::mt19937 mt(std::random_device{ }());
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std::uniform_int_distribution<int> dist(0, 2);
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for (int i = 0; i < R_MAX; ++i) {
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mr[dist(mt)]++;
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}
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//
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for (int i = 0; i < 4; ++i) {
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cout << i << ": " << rr[i] << " " << mr[i] << endl;
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}
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return 0;
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}
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```
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```
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0: 335654 333673
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1: 332437 333180
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2: 331909 333147
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3: 0 0
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```
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まあじゃんけんゲームには影響ないですよね。それはそう。
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