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- #include <bits/stdc++.h>
- using namespace std;
- bool taken[21];
- vector <char> V;
- int pos=1;
- int n;
- void generate(int i)
- {
- for(int j=0;j<=n;j++)
- {
- if(taken[j]==0)
- {
- taken[j]=1;
- cout<<j;
- if(i==n)
- {
- cout <<endl;
- //return;
- }
- generate(i+1);
- taken[j]=0;
- }
- }
- }
- int main()
- {
- memset(taken,0,sizeof(taken));
- n=2;
- generate(0);
- return 0;
- }
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