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  1. #include <stdio.h>
  2.  
  3. int main()
  4. {
  5.  int T,n,m,i, check = 0;
  6.  double sum = 0;
  7.  
  8.  
  9.  
  10.   scanf("%d %d",&m,&n);
  11.   sum = (double)m / (double)n;
  12.  
  13.   if(n < 0) printf("0");
  14.   else if(n > m) printf("0");
  15.  
  16.   else if(0 <= n && n <= m)
  17.   {
  18.        if(n == 0 && m ==0){ printf("0"); return 0;}
  19.     m--;
  20.     n--;
  21.  
  22.   while(n > 0)
  23.   {
  24.    if(check == 0)
  25.    {
  26.     sum = sum * (double)m; // 컴비네이션 쓰면 값이 커져서 분할시켰다. 
  27.     m--;
  28.     check = 1;        
  29.    }
  30.  
  31.  
  32.    else if(check == 1)
  33.    {
  34.     sum = sum / (double)n;
  35.     n--;
  36.     check = 0;  
  37.    }  
  38.   }
  39.   printf("%.f",sum);
  40.  
  41. }
  42.  
  43.  
  44.  return 0;
  45.  
  46. }
Success #stdin #stdout 0s 3464KB
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https://ideone.com/6OwWSK
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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