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Cod sursa(job #918813)
#include<iostream>
#include<fstream>
using namespace std;
ifstream in("permutari.in");
ofstream out("permutari.out");
int s[100],n;
void scrie(){
for(int i=1;i<=n;i++)
out<<s[i]<<" ";
out<<'\n';}
int valid(int k){
for(int i=1;i<k;i++)
if(s[i]==s[k])
return 0;
return 1;
}
void init(int k){
s[k]=0;}
void BKT(int k){
if(k==n+1)scrie();
else{init(k);
while(s[k]<n){
s[k]++;
if (valid(k))
BKT(k+1);
}
}
}
int main(){
in>>n;
BKT(1);
return 0;
}