34 lines
739 B
C++
34 lines
739 B
C++
#include<bits/stdc++.h>
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using namespace std;
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vector<vector<int>> results;
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void backtrack(vector<int>& current, vector<bool>& used, int n){
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if(current.size() == n){
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results.push_back(current);
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return;
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}
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for(int i = 1; i <= n; i++){
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if(!used[i]){
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current.push_back(i);
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used[i] = true;
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backtrack(current, used, n);
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current.pop_back();
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used[i] = false;
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}
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}
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}
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int main(){
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int n; cin >> n;
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vector<int> current;
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vector<bool> used(n+1, false);
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backtrack(current, used, n);
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for(const auto& perm:results){
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for(int num:perm){
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cout << num << " ";
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}
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cout << endl;
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}
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return 0;
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} |