Submission #1031703

#	Time	Username	Problem	Language	Result	Execution time	Memory
1031703		stdfloat	Strange Device (APIO19_strange_device)	C++17	5 / 100	3539 ms	524288 KiB

strange_device

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

using ll = long long;

int main() {
    ios::sync_with_stdio(false); cin.tie(nullptr);

    int n;
    ll A, B;
    cin >> n >> A >> B;

    int L = 0;
    set<pair<int, int>> s;
    for (int i = 1; ; i++) {
        int x = (i + i / B) % A, y = i % B;
        if (s.find({x, y}) != s.end()) {
            L = i - 1;
            break;
        }

        s.insert({x, y});
    }

    vector<int> p(L + 1);
    while (n--) {
        ll l, r;
        cin >> l >> r;

        if (L <= r - l + 1) {
            p[0]++;
            continue;
        }

        p[l % L]++; p[r % L + 1]--;

        if (l % L > r % L) p[0]++;
    }

    int cnt = 0;
    for (int i = 0; i < L; i++) {
        p[i] += p[i - 1];
        cnt += !!p[i];
    }

    cout << cnt << '\n';
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 5
• Subtask 3: 5 / 5
• Subtask 4: 0 / 5
• Subtask 5: 0 / 5
• Subtask 6: 0 / 20
• Subtask 7: 0 / 20
• Subtask 8: 0 / 30