回答編集履歴
2
関数を改良
answer
CHANGED
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@@ -34,29 +34,20 @@
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34
34
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---
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35
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36
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「追記」
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37
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-
ユーザー的な情報を用いて出力できるよう修正して
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37
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+
ユーザー的な情報を用いて出力できるよう修正してたよ。
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38
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-
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38
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この手法を使えば小数点等でも対応出来ると思うよ。
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39
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```PHP
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<?php
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42
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-
function
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42
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+
function array_count_by_kokugo ($arr) {
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$results = [];
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foreach ($arr as $it) {
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-
$key =
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$key = (string)$it['kokugo'];
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if (!isset($results[$key])) $results[$key] = [];
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$results[$key][] = $it;
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}
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return $results;
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}
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51
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-
function get_kokugo ($it) {
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-
return (string)$it['kokugo'];
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53
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-
}
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54
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-
function cmp ($a, $b) {
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-
$a2 = (float)get_kokugo($a);
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-
$b2 = (float)get_kokugo($b);
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-
if ($a2 == $b2) return 0;
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-
return ($a2 < $b2) ? 1 : -1;
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59
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-
}
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$a = [
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["name" => "a", "kokugo" => 80.5],
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@@ -69,15 +60,21 @@
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60
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["name" => "h", "kokugo" => 87.5],
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70
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["name" => "g", "kokugo" => 80],
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71
62
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];
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63
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+
usort($a, function ($a, $b) {
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72
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-
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64
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+
$a2 = $a['kokugo'];
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65
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$b2 = $b['kokugo'];
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66
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if ($a2 == $b2) return 0;
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67
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return ($a2 < $b2) ? 1 : -1;
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68
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});
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69
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$rank = 1;
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75
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-
foreach (
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71
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foreach (array_count_by_kokugo($a) as $point => $users) {
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foreach ($users as $user) {
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echo "{$rank}位: {$user['name']} ({$point})\n";
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}
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$rank += count($users);
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}
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+
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81
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?>
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82
79
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83
80
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1位: d (100)
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1
追記、様々なケースに耐えられるよう改造
answer
CHANGED
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@@ -29,4 +29,64 @@
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29
29
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6位: 88
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30
30
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6位: 88
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31
31
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9位: 85
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32
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+
```
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33
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+
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34
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+
---
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35
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+
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36
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+
「追記」
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37
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+
ユーザー的な情報を用いて出力できるよう修正してみた。
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38
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+
うーん、あんまり美しくないかも？
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39
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+
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40
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```PHP
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41
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<?php
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42
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function array_count_by ($fn, $arr) {
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$results = [];
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foreach ($arr as $it) {
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$key = $fn($it);
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if (!isset($results[$key])) $results[$key] = [];
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$results[$key][] = $it;
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}
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49
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return $results;
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50
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}
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51
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function get_kokugo ($it) {
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52
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return (string)$it['kokugo'];
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53
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}
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54
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function cmp ($a, $b) {
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55
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$a2 = (float)get_kokugo($a);
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56
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$b2 = (float)get_kokugo($b);
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57
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if ($a2 == $b2) return 0;
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58
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return ($a2 < $b2) ? 1 : -1;
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59
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}
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60
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61
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$a = [
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62
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["name" => "a", "kokugo" => 80.5],
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["name" => "b", "kokugo" => 100],
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64
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["name" => "c", "kokugo" => 81],
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65
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["name" => "d", "kokugo" => 100],
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66
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["name" => "e", "kokugo" => 90.5],
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67
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["name" => "f", "kokugo" => 90.5],
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68
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["name" => "g", "kokugo" => 90.5],
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69
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["name" => "h", "kokugo" => 87.5],
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70
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["name" => "g", "kokugo" => 80],
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71
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];
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72
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usort($a, 'cmp');
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73
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74
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$rank = 1;
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75
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foreach (array_count_by('get_kokugo', $a) as $point => $users) {
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76
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foreach ($users as $user) {
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77
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echo "{$rank}位: {$user['name']} ({$point})\n";
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78
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}
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79
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$rank += count($users);
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80
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}
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81
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?>
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82
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+
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83
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+
1位: d (100)
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84
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1位: b (100)
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85
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3位: f (90.5)
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86
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3位: g (90.5)
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87
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3位: e (90.5)
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88
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6位: h (87.5)
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89
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7位: c (81)
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90
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+
8位: a (80.5)
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91
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+
9位: g (80)
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32
92
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```
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