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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4.     int M;
  5.     int price[5]; // a
  6.     int stock[5]; // b
  7.     int store = 0; // i
  8.     long long cost = 0; // 合計金額
  9.  
  10.     printf("M?: \n");
  11.     scanf("%d", &M);
  12.  
  13.     printf("a_i, b_i? (負の値で入力終了):\n");
  14.     while (store < 5) {
  15.         int p, s;
  16.         scanf("%d", &p);
  17.         if (p < 0) {
  18.             break;
  19.         }
  20.         scanf("%d", &s);
  21.         price[store] = p;
  22.         stock[store] = s;
  23.         store++;
  24.     }
  25.  
  26.     for (int i = 0; i < store - 1; i++) {
  27.         int min = i; // とりあえずi番目を一番安いと仮定
  28.         // i番目より後ろで、もっと安い店がないか探す
  29.         for (int j = i + 1; j < store; j++) {
  30.             if (price[j] < price[min]) {
  31.                 min = j; // もっと安い店が見つかったら、その場所を覚える
  32.             }
  33.         }
  34.         int temp_p = price[i];
  35.         price[i] = price[min];
  36.         price[min] = temp_p;
  37.         int temp_s = stock[i];
  38.         stock[i] = stock[min];
  39.         stock[min] = temp_s;
  40.     }
  41.  
  42.     int bag = M;
  43.     for (int i = 0; i < store; i++) {
  44.         if (bag == 0) {
  45.             break;
  46.         }
  47.         int bag_amount;
  48.         if (bag <= stock[i]) {
  49.             bag_amount = bag;
  50.         } else {
  51.             bag_amount = stock[i];
  52.     }
  53.  
  54.     cost += (long long)bag_amount * price[i];
  55.     bag -= bag_amount;
  56.     }
  57.  
  58.     printf("%lld円必要です\n", cost);
  59.     return 0;
  60. }
Success #stdin #stdout 0.01s 5276KB
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stdout
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M?: 
a_i, b_i? (負の値で入力終了):
2400円必要です
https://ideone.com/s1UPcp
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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