Submission #826960

#	Time	Username	Problem	Language	Result	Execution time	Memory
826960		t6twotwo	Passport (JOI23_passport)	C++17	16 / 100	25 ms	1996 KiB

passport

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int N;
    cin >> N;
    vector<int> L(N), R(N);
    for (int i = 0; i < N; i++) {
        cin >> L[i] >> R[i];
        L[i]--;
    }
    int Q, X;
    cin >> Q >> X;
    X--;
    if (N <= 300) {
        vector<int> dp(N);
        iota(dp.begin(), dp.end(), 0);
        dp[X] = X + 1;
        for (int ans = 1; ; ans++) {
            auto pd = dp;
            iota(dp.begin(), dp.end(), 0);
            for (int i = 0; i < N; i++) {
                for (int j = i; j < pd[i]; j++) {
                    dp[min(i, L[j])] = max({dp[min(i, L[j])], pd[i], R[j]});
                }
            }
            if (dp[0] == N) {
                cout << ans << "\n";
                return 0;
            }
            if (dp == pd) {
                break;
            }
        }
        cout << -1 << "\n";
        return 0;
    }
    int ans = 0;
    for (int f = R[0]; X < N - 1;) {
        if (X == f) {
            ans = -1;
            break;
        }
        ans++;
        for (int i = f - X; i; i--) {
            f = max(f, R[++X]);
        }
    }
    cout << ans << "\n";
    return 6/22;
}

• Subtask 1: 0 / 6
• Subtask 2: 16 / 16
• Subtask 3: 0 / 24
• Subtask 4: 0 / 8
• Subtask 5: 0 / 46