Submission #693700

#	Time	Username	Problem	Language	Result	Execution time	Memory
693700		saayan007	Cryptography (NOI20_crypto)	C++17	14 / 100	1092 ms	9684 KiB

Crypto

#include <bits/stdc++.h>
using namespace std;

using ll = long long;
using pi = pair<int, int>;
using pl = pair<ll, ll>;
using vi = vector<int>;
using vl = vector<ll>;
using vpi = vector<pi>;
using vpl = vector<pl>;

#define fur(i, a, b) for(ll i = a; i <= (ll) b; ++i)
#define ruf(i, a, b) for(ll i = a; i >= (ll) b; --i)
#define fr first
#define sc second
#define mp make_pair
#define pb push_back
#define eb emplace_back
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
#define nl "\n"

const ll mod = 1e9L + 7;
const ll mxn = 3e5L + 5;

ll n;
pl p[mxn];


int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    cin >> n;
    fur(i, 1, n) {
        cin >> p[i].fr;
        p[i].sc = i;
    }
    sort(p + 1, p + n + 1);
    ll a[n + 1];
    fur(i, 1, n) {
        a[p[i].sc] = i;
    }

    ll perm[n + 1];
    iota(perm + 1, perm + n + 1, 1);
    // fur(i, 1, n)
        // cout << perm[i] << ' ';
    // cout << nl;
    ll res = 0;
    do {
        bool same = 1; 
        fur(i, 1, n) {
            if(perm[i] != a[i]) {
                same = 0;
                break;
            }
        }
        ++res;
        if(same)
            break;
    } while(next_permutation(perm + 1, perm + n + 1));

    cout <<res << nl;
}

• Subtask 1: 5 / 5
• Subtask 2: 9 / 9
• Subtask 3: 0 / 10
• Subtask 4: 0 / 11
• Subtask 5: 0 / 21
• Subtask 6: 0 / 13
• Subtask 7: 0 / 19
• Subtask 8: 0 / 12