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添加 0040.组合总和II.md C语言版本
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@ -392,7 +392,66 @@ var combinationSum2 = function(candidates, target) {
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}
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};
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```
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C:
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```c
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int* path;
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int pathTop;
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int** ans;
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int ansTop;
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//记录ans中每一个一维数组的大小
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int* length;
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int cmp(const void* a1, const void* a2) {
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return *((int*)a1) - *((int*)a2);
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}
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void backTracking(int* candidates, int candidatesSize, int target, int sum, int startIndex) {
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if(sum >= target) {
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//若sum等于target,复制当前path进入
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if(sum == target) {
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int* tempPath = (int*)malloc(sizeof(int) * pathTop);
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int j;
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for(j = 0; j < pathTop; j++) {
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tempPath[j] = path[j];
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}
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length[ansTop] = pathTop;
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ans[ansTop++] = tempPath;
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}
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return ;
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}
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int i;
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for(i = startIndex; i < candidatesSize; i++) {
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//对同一层树中使用过的元素跳过
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if(i > startIndex && candidates[i] == candidates[i-1])
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continue;
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path[pathTop++] = candidates[i];
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sum += candidates[i];
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backTracking(candidates, candidatesSize, target, sum, i + 1);
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//回溯
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sum -= candidates[i];
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pathTop--;
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}
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}
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int** combinationSum2(int* candidates, int candidatesSize, int target, int* returnSize, int** returnColumnSizes){
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path = (int*)malloc(sizeof(int) * 50);
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ans = (int**)malloc(sizeof(int*) * 100);
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length = (int*)malloc(sizeof(int) * 100);
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pathTop = ansTop = 0;
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//快速排序candidates,让相同元素挨到一起
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qsort(candidates, candidatesSize, sizeof(int), cmp);
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backTracking(candidates, candidatesSize, target, 0, 0);
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*returnSize = ansTop;
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*returnColumnSizes = (int*)malloc(sizeof(int) * ansTop);
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int i;
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for(i = 0; i < ansTop; i++) {
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(*returnColumnSizes)[i] = length[i];
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}
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return ans;
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}
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```
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-----------------------
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* 作者微信:[程序员Carl](https://mp.weixin.qq.com/s/b66DFkOp8OOxdZC_xLZxfw)
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