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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <errno.h>
  4.  
  5. int* twoSum(int* nums, int numsSize, int target, int* returnSize) {
  6. 	int* ret;
  7. 	ret = malloc(2*sizeof(int));
  8. 	if (!ret) {
  9. 		return NULL;
  10. 	}
  11.  
  12. 	for (int i = 0; i < numsSize; ++i) {
  13. 		for (int j = i+1; j < numsSize; ++j) {
  14. 			if (nums[j] + nums[i] == target) {
  15. 				ret[0] = i;
  16. 				ret[1] = j;
  17. 				*returnSize = 2;
  18. 				return ret;
  19. 			}
  20. 		}
  21. 	}
  22.  
  23. 	*returnSize = 0;
  24. 	printf("here");
  25. 	return 0;
  26. }
  27.  
  28. int main(void) {
  29. 	int nums[4] = {1, 2, 9, 4};
  30. 	int numsSize = sizeof(nums) / sizeof(nums[0]);
  31. 	int target = 6;
  32. 	int* returnSize = 0;
  33. 	int* res = 0;
  34.  
  35. 	res = twoSum(nums, numsSize, target, &returnSize);
  36. 	printf("res:%d, res[0]:%d, res[1]:%d\r\n", *res, res[0], res[1]);
  37. 	if (res == NULL) {
  38. 		printf("Memory error\r\n");
  39. 		return -1;
  40. 	}
  41. 	else if (*res == ENODATA) {
  42. 		printf("No solution\r\n");
  43. 		return -1;
  44. 	}
  45.  
  46. 	printf("The results:\r\ntarget:%d, index %d: %d and index %d: %d\r\n",\
  47. 	target,\
  48. 	res[0], nums[res[0]],\
  49. 	res[1], nums[res[1]]);
  50.  
  51. 	return 0;
  52. }
Success #stdin #stdout 0.01s 5320KB
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stdin
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Standard input is empty
stdout
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res:1, res[0]:1, res[1]:3
The results:
target:6, index 1: 2 and index 3: 4
https://ideone.com/rSeYbM
language:
C (gcc 8.3)
created:
2 hours ago
visibility:
public

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