fork(2) download 
  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. struct rank_pair {
  5. 	double val;
  6. 	size_t ind;
  7. };
  8.  
  9. int cmp_rank_pair(const void* a, const void* b) {
  10. 	struct rank_pair *lhs = (struct rank_pair*)a;
  11. 	struct rank_pair *rhs = (struct rank_pair*)b;
  12. 	return lhs->val < rhs->val ? -1 : (lhs->val > rhs->val ? 1 : 0);
  13. }
  14.  
  15. void rank(double a[], int r[], size_t n) {
  16. 	struct rank_pair *tmp = malloc(n*sizeof(struct rank_pair));
  17. 	for (int i = 0 ; i != n ; i++) {
  18. 		tmp[i].val = a[i];
  19. 		tmp[i].ind = i;
  20. 	}
  21. 	qsort(tmp, n, sizeof(struct rank_pair), cmp_rank_pair);
  22. 	for (int i = 0 ; i != n ; i++) {
  23. 		r[tmp[i].ind] = i+1;
  24. 	}
  25. 	free(tmp);
  26. }
  27.  
  28. int main(void) {
  29. 	const size_t N = 10;
  30. 	double a[] = {0.25, 0.54, 0.38, 0.32, 0.49, 0.06, 0.41, 0.21, 0.98, 0.23};
  31.     int r[N];
  32.     rank(a, r, N);
  33.     for (int i = 0 ; i != N ; i++) {
  34.     	printf("%d\n", r[i]);
  35.     }
  36. 	return 0;
  37. }
  38.  
Success #stdin #stdout 0s 2292KB
comments (?)
stdin 
Standard input is empty
stdout 
4
9
6
5
8
1
7
2
10
3
https://ideone.com/Fe7Pww
language:
C99 (gcc 8.3)
created:
8 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!