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3Sum.c
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#include <stdio.h>
#include <stdlib.h>
int arr[] = 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/**
* Return an array of arrays of size *returnSize.
* The sizes of the arrays are returned as *returnColumnSizes array.
* Note: Both returned array and *columnSizes array must be malloced, assume caller calls free().
*/
int cmp(const void* a, const void* b)
{
return *(int*)a - *(int*)b;
}
int** threeSum(int* nums, int numsSize, int* returnSize, int** returnColumnSizes)
{
int l, h, tmp = 0;
int l1, l2, h1, h2;
int i;
*returnSize = 0;
if (numsSize < 3)
return NULL;
int** ret = (int**)malloc(sizeof(int*) * (numsSize + 1) * 6);
*returnColumnSizes = (int *)malloc(sizeof(int) * (numsSize + 1) * 6);
qsort(nums, numsSize, sizeof(int), cmp);
//init
l1 = l2 = 0;
h1 = h2 = numsSize - 1;
for (i = 0; i < numsSize; i++) {
tmp = nums[i];
if (tmp < 0 && tmp > nums[l1])
l2 = i;
else if (tmp >= 0) {
h1 = i;
break;
}
}
if (nums[0] > 0)
return NULL;
int flag = 0;
if (nums[h1] == 0) {
if (h2 > h1 + 1 && nums[h1] == nums[h1 + 2]) {
flag = 1;
}
if (flag == 1) {
ret[*returnSize] = (int*)malloc(sizeof(int) * 3); // 每次找到一组，二级指针就分配三个空间
(*returnColumnSizes)[*returnSize] = 3; // 记录列数，非常骚而吊诡的操作
ret[*returnSize][0] = 0;
ret[*returnSize][1] = 0;
ret[*returnSize][2] = 0;
(*returnSize)++;
}
}
// compare
for (l = l1; l <= l2; l++) {
if (l != 0 && nums[l] == nums[l - 1])
continue;
if (nums[l] == 0)
break;
for (h = h2; h >= h1; h--) {
if(h < h2 && nums[h] == nums[h + 1])
continue;
// L + H > 0
if (nums[l] + nums[h] > 0) {
int target = (nums[l] + nums[h]) * -1;
int low = l + 1, high = l2;
while (low <= high){
//printf("%d %d %d \n", l, h, 0);
int middle = (low + high) / 2;
if (target == nums[middle]){
ret[*returnSize] = (int*)malloc(sizeof(int) * 3); // 每次找到一组，二级指针就分配三个空间
(*returnColumnSizes)[*returnSize] = 3; // 记录列数，非常骚而吊诡的操作
ret[*returnSize][0] = nums[l];
ret[*returnSize][1] = nums[middle];
ret[*returnSize][2] = nums[h];
(*returnSize)++;
break;
}
else if (target > nums[middle]){
low = middle + 1;
}
else if (target < nums[middle]){
high = middle - 1;
}
}
}
// L + H < 0
else if (nums[l] + nums[h] < 0) {
int target = (nums[l] + nums[h] )* -1;
int low = h1, high = h - 1;
while (low <= high){
//printf("%d %d %d \n", l, h, 0);
int middle = (low + high) / 2;
if (target == nums[middle]){
ret[*returnSize] = (int*)malloc(sizeof(int) * 3); // 每次找到一组，二级指针就分配三个空间
(*returnColumnSizes)[*returnSize] = 3; // 记录列数，非常骚而吊诡的操作
ret[*returnSize][0] = nums[l];
ret[*returnSize][1] = nums[middle];
ret[*returnSize][2] = nums[h];
(*returnSize)++;
break;
}
else if (target > nums[middle]){
low = middle + 1;
}
else if (target < nums[middle]){
high = middle - 1;
}
}
}
// L + H = 0;
else if (nums[h1] == 0) {
//record
if (*returnSize > 0 && ret[*returnSize - 1][0] == nums[l] && ret[*returnSize - 1][2] == nums[h])
continue;
ret[*returnSize] = (int*)malloc(sizeof(int) * 3); // 每次找到一组，二级指针就分配三个空间
(*returnColumnSizes)[*returnSize] = 3; // 记录列数，非常骚而吊诡的操作
ret[*returnSize][0] = nums[l];
ret[*returnSize][1] = nums[h1];
ret[*returnSize][2] = nums[h];
(*returnSize)++;
}
}
}
return ret;
}
int main()
{
int *rtarr = NULL;
int len = 0;
int **p_arr = threeSum(arr, sizeof(arr)/sizeof(int), &len, &rtarr);
int i = 0;
printf("len = %d\n", len);
for(; i < len; i++){
printf("%d, %d, %d\n", p_arr[i][0], p_arr[i][1], p_arr[i][2]);
}
return 0;
}