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  1. /*
  2.  * https://p...content-available-to-author-only...r.net/problem=1
  3.  */
  4. #include <stdio.h>
  5.  
  6. #define SUMKI(N,K) ((K) * (N) * ((N) + 1) / 2)
  7. #define SUMK(N,K) (SUMKI((((N) - 1) / (K)), (K)))
  8.  
  9. int main(void) {
  10. 	int n = 1000;
  11. 	int sum3 = SUMK(n, 3);
  12. 	int sum5 = SUMK(n, 5);
  13. 	int sum15 = SUMK(n , 15);
  14.  
  15. 	printf("%d\n", sum3 + sum5 - sum15);
  16.  
  17. 	return 0;
  18. }
  19.  
Success #stdin #stdout 0s 2248KB
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https://ideone.com/H5qnii
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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