Submission #171602

#	Time	Username	Problem	Language	Result	Execution time	Memory
171602		rama_pang	Strange Device (APIO19_strange_device)	C++14	100 / 100	698 ms	31444 KiB

strange_device

#include <bits/stdc++.h>
using namespace std;
using lint = long long;
const lint INF = 1e18 + 100;

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);

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

    lint g = __gcd(A, B + 1);
    lint t = 0;

    if ((A / g) > ((INF + INF) / B)) {
        t = INF;
    } else {
        t = (A / g) * B;
    }

    vector<pair<lint, lint>> interval;
    
    for (int i = 0; i < n; i++) {
        lint l, r;
        cin >> l >> r;
        
        if (r - l + 1 >= t) {
            interval.emplace_back(0, t - 1);
        } else {
            l %= t, r %= t;
            if (l <= r) {
                interval.emplace_back(l, r);
            } else {
                interval.emplace_back(l, t - 1);
                interval.emplace_back(0, r);
            }
        }
    }

    sort(begin(interval), end(interval));
    lint ans = 0;

    for (int i = 0; i < (int)interval.size(); i++) {
        lint l = interval[i].first;
        lint r = interval[i].second;
        int nxt = i;
        while (nxt + 1 < (int)interval.size() && interval[nxt + 1].first <= r) {
            r = max(r, interval[nxt + 1].second);
            nxt++;
        }
        ans += (r - l + 1);
        i = nxt;
    }

    cout << ans << "\n";
    return 0;
}

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