216. Combination Sum III LeetCode
2016-02-14 18:52
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题意：给出n和k，表示你可以使用1-9中的n个数加和组成k，每种组合中1-9的每个数组只能使用一次。要求组合中数字按升序排序。
题解：递归搜索。
题解：递归搜索。
class Solution {
public:
void dfs(int n,int k,int x,vector<int> v,vector<vector<int>>& ans)
{
if(n < 0 || k < 0) return;
if(n == 0 && k == 0)
{
ans.push_back(v);
return ;
}
for(int i = x; i <= 9; i++)
{
v.push_back(i);
dfs(n - i,k - 1,i + 1,v,ans);
v.pop_back();
}
}
vector<vector<int>> combinationSum3(int k, int n) {
vector<vector<int>> ans;
vector<int> v;
dfs(n,k,1,v,ans);
return ans;
}
};
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