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  1. #include <stdio.h>
  2.  
  3. int main(void)
  4. {
  5.     int a[9],b[9];
  6.     char k[9]={'+','+','+','+','+','+','+','+','+'};
  7.     int i,bc,next,ans,ans_cnt = 0;
  8.  
  9.     while(ans_cnt < 10 && k[8] == '+')
  10.     {
  11.         //初期化
  12.         bc = 1;
  13.         next = 1;
  14.  
  15.         for(i = 0; i < 9; i++)
  16.         {
  17.             a[i] = i+1;
  18.             b[i] = 1;
  19.         }
  20.  
  21.         //減算＆乗算
  22.         for(i = 1; i < 9; i++)
  23.         {
  24.             switch(k[i-1]){
  25.             case '-':
  26.                 a[i] *= -1;
  27.             case '+':
  28.                 bc++;
  29.             default:
  30.                 b[bc-1] *= a[i];
  31.                 break;
  32.             }
  33.         }
  34.         //加算
  35.         ans = b[0];
  36.         for(i = 1; i < bc; i++)
  37.             ans += b[i];
  38.  
  39.         //答え合わせ
  40.         if(ans==100){
  41.             ans_cnt++;
  42.             printf("%d個目の答え:",ans_cnt);
  43.             for(i = 0; i < 8; i++)
  44.                 printf("%d%c",i+1,k[i]);
  45.             printf("%d\n",9);
  46.         }
  47.  
  48.         //ずらす
  49.         for(i = 0; next; i++)
  50.             switch(k[i]){
  51.             case '+':
  52.                 k[i] = '-';
  53.                 next = 0;
  54.                 break;
  55.             case '-':
  56.                 k[i] = '*';
  57.                 next = 0;
  58.                 break;
  59.             case '*':
  60.                 k[i] = '+';
  61.                 break;
  62.  
  63.             }
  64.     }
  65.  
  66.     return 0;
  67. }
Success #stdin #stdout 0.01s 1720KB
comments (?)
stdin
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Standard input is empty
stdout
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1個目の答え:1*2*3*4+5+6+7*8+9
2個目の答え:1-2+3*4*5+6*7+8-9
3個目の答え:1-2+3*4*5-6+7*8-9
4個目の答え:1+2+3+4+5+6+7+8*9
5個目の答え:1*2*3+4+5+6+7+8*9
6個目の答え:1-2*3+4*5+6+7+8*9
7個目の答え:1+2*3+4*5-6+7+8*9
8個目の答え:1-2*3-4+5*6+7+8*9
9個目の答え:1+2-3*4+5*6+7+8*9
10個目の答え:1*2*3*4+5+6-7+8*9
https://ideone.com/G0nWb
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

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