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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. 	    int n, last = 0, f = 1;
  5.     printf("Введите n: "); scanf("%d", &n);
  6.     double res = 0;
  7.     for(int i=1; i <= n; i++) {
  8.        f *= i;
  9.        int sum = 0;   
  10.        for(int k=last+1; k <= last + i; k++) 
  11.            sum += k; 
  12.         last += i;
  13.         res += 1.0 * f / (sum * sum);
  14.     }
  15.     printf("%f", res);
  16. 	return 0;
  17. }
  18.  
Success #stdin #stdout 0s 4376KB
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Введите n: 1.106667
https://ideone.com/8WCV0T
language:
C (gcc 8.3)
created:
3 years ago
visibility:
public

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