Merge remote-tracking branch 'origin/remote' into remote

This commit is contained in:
ArthurP
2021-09-27 19:59:51 +01:00

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@ -279,6 +279,74 @@ var subsetsWithDup = function(nums) {
```
C:
```c
int* path;
int pathTop;
int** ans;
int ansTop;
//负责存放二维数组中每个数组的长度
int* lengths;
//快排cmp函数
int cmp(const void* a, const void* b) {
return *((int*)a) - *((int*)b);
}
//复制函数将当前path中的元素复制到ans中。同时记录path长度
void copy() {
int* tempPath = (int*)malloc(sizeof(int) * pathTop);
int i;
for(i = 0; i < pathTop; i++) {
tempPath[i] = path[i];
}
ans = (int**)realloc(ans, sizeof(int*) * (ansTop + 1));
lengths[ansTop] = pathTop;
ans[ansTop++] = tempPath;
}
void backTracking(int* nums, int numsSize, int startIndex, int* used) {
//首先将当前path复制
copy();
//若startIndex大于数组最后一位元素的位置返回
if(startIndex >= numsSize)
return ;
int i;
for(i = startIndex; i < numsSize; i++) {
//对同一树层使用过的元素进行跳过
if(i > 0 && nums[i] == nums[i-1] && used[i-1] == false)
continue;
path[pathTop++] = nums[i];
used[i] = true;
backTracking(nums, numsSize, i + 1, used);
used[i] = false;
pathTop--;
}
}
int** subsetsWithDup(int* nums, int numsSize, int* returnSize, int** returnColumnSizes){
//声明辅助变量
path = (int*)malloc(sizeof(int) * numsSize);
ans = (int**)malloc(0);
lengths = (int*)malloc(sizeof(int) * 1500);
int* used = (int*)malloc(sizeof(int) * numsSize);
pathTop = ansTop = 0;
//排序后查重才能生效
qsort(nums, numsSize, sizeof(int), cmp);
backTracking(nums, numsSize, 0, used);
//设置一维数组和二维数组的返回大小
*returnSize = ansTop;
*returnColumnSizes = (int*)malloc(sizeof(int) * ansTop);
int i;
for(i = 0; i < ansTop; i++) {
(*returnColumnSizes)[i] = lengths[i];
}
return ans;
}
```
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