Submission #836753

#	Time	Username	Problem	Language	Result	Execution time	Memory
836753		nonono	Strange Device (APIO19_strange_device)	C++14	100 / 100	574 ms	68984 KiB

strange_device

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

const long long inf = 1e18;

int main() {
    cin.tie(0)->sync_with_stdio(0);

    long long n, a, b;
    cin >> n >> a >> b;

    long long k = a / __gcd(a, b + 1);
    long long x = 1;

    if(inf / k < b) x = inf + 5;
    else x = b * k;

    vector<pair<long long, bool>> p;

    for(int i = 1; i <= n; i ++) {
        long long l, r;
        cin >> l >> r;

        if(r - l + 1 >= x) {
            cout << x << "\n";
            return 0;
        }

        long long L = l % x;
        long long R = r % x;

        if(L <= R) {
            p.push_back({L, true});
            p.push_back({R + 1, false});
        } else {
            p.push_back({L, true});
            p.push_back({x, false});

            p.push_back({0, true});
            p.push_back({R + 1, false});
        }
    }

    sort(p.begin(), p.end());

    long long total = 0;
    int cnt = 0;
    for(int i = 0; i < p.size(); i ++) {
        if(cnt) {
            total += p[i].first - p[i - 1].first;
        }

        cnt += (p[i].second ? 1 : -1);
    }

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

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:48:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, bool> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |     for(int i = 0; i < p.size(); i ++) {
      |                    ~~^~~~~~~~~~

• 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