LeetCode/Scripts/46.cpp at master · zzz0906/LeetCode · GitHub

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#include <vector>
using namespace std;
class Solution {
public:
    vector<int> tmpnums;
    vector<int> original;
    vector<int> tmp;
    vector<vector<int> > answer;
    vector<vector<int> > realanswer;
    void dfs(int layer){
        if (layer == tmpnums.size())
            {
                answer.push_back(tmp);
                return;
            }
        for (int i = 1; i < tmpnums.size()+1; i++){
            bool flag = false;
            for (int j = 0; j < layer;j++)
                if (tmp[j] == i){
                    flag = true;
                    break;
                }
            if (flag == false){
                tmp.push_back(i);
                dfs(layer+1);
                tmp.pop_back();
            }
        }
    }
    vector<vector<int> > permute(vector<int>& nums) {
        tmpnums = nums;
        original = nums;
        dfs(0);
        for (int i = 0; i < answer.size();i++){
            vector<int> tmp;
            for (int j = 0; j < answer[i].size();j++){
                tmp.push_back(original[answer[i][j]-1]);
            }
            realanswer.push_back(tmp);
        }
        return realanswer;
    }
};