Submission #240487

#	Time	Username	Problem	Language	Result	Execution time	Memory
240487		valerikk	Strange Device (APIO19_strange_device)	C++14	65 / 100	815 ms	40260 KiB

strange_device

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

#define int long long

const int INF = 2e18 + 7;

int32_t main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, a, b;
    cin >> n >> a >> b;
    a /= __gcd(a, b + 1);
    int p = INF / b <= a ? INF : a * b;
    vector<pair<int, int>> arr;
    while (n--) {
        int l, r;
        cin >> l >> r;
        l %= p;
        r %= p;
        if (l <= r) {
            arr.emplace_back(l, 1);
            arr.emplace_back(r + 1, -1);
        } else {
            arr.emplace_back(0, 1);
            arr.emplace_back(r + 1, -1);
            arr.emplace_back(l, 1);
            arr.emplace_back(p, -1);
        }
    }
    sort(arr.begin(), arr.end());
    int ans = 0, bal = 0;
    for (int i = 0; i + 1 < arr.size(); i++) {
        bal += arr[i].second;
        if (bal > 0) ans += arr[i + 1].first - arr[i].first;
    }
    cout << ans;
    return 0;
}

Compilation message (stderr)

strange_device.cpp: In function 'int32_t main()':
strange_device.cpp:33:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i + 1 < arr.size(); i++) {
                     ~~~~~~^~~~~~~~~~~~

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