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OI-codes/Luogu/P2524/P2524.cpp

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#include <bits/stdc++.h>
using namespace std;
int n, ans, a[11], b[11];
bool cmp() {
for (int i = 0; i < n; i++) {
if (a[i] != b[i]) {
return false;
}
}
return true;
}
int main() {
scanf("%d", &n);
for (int i = 0; i < n; i++) {
scanf("%1d", a + i);
b[i] = i + 1;
}
while (!cmp()) {
next_permutation(b, b + n);
ans++;
}
cout << ++ans << endl;
return 0;
}