با سلام و وقت بخیر
# include <algorithm>
# include <iostream>
using namespace std;
char a[20];
int main(){
string s;
cin >> s;
for (int i = 0 ; i < s.size() ; i++){
a[i] = s[i];
}
if (next_permutation(a , a + s.size())){
for (int i = 0 ; i < s.size() ; i++)
cout << a[i];
}else{
cout << "0\n";
}
return 0;
}
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