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- #include <iostream>
- using namespace std;
- bool recur(int* ans, int i, int v, int n, bool** x){
- bool flag = true;
- if(i==n){
- for(int k = 0;k<n;k++){
- cout<<(ans[k]+1)<<" ";
- }
- cout<<endl;
- return true;
- }
- for(int j = 0;j<n;j++){
- for(int k = 0;k<n;k++)
- if(ans[k]==j)
- flag = false;
- if((x[v][j]||!x[j][v])&&flag){
- ans[i]=j;
- i++;
- recur(ans, i, j, n, x);
- }
- flag = true;
- }
- return false;
- }
- int main() {
- int n,m;
- cin>>n>>m;
- bool** x = new bool*[n];
- for(int i=0;i<n;i++)
- x[i]=new bool[n];
- for(int i = 0;i<n;i++)
- for(int j=0;j<n;j++)
- x[i][j]=false;
- for(int i =0;i<m;i++){
- int a,b;
- cin>>a>>b;
- x[a-1][b-1]=true;
- }
- bool flag = false;
- for(int k = 0;k<n;k++){
- int* ans = new int[n];
- ans[0]=k;
- flag = recur(ans, 1, k, n, x);
- }
- if(!flag)
- cout<<"no";
- }
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