Submission #147762

#	Time	Username	Problem	Language	Result	Execution time	Memory
147762		kuroni	Strange Device (APIO19_strange_device)	C++17	100 / 100	1028 ms	19084 KiB

strange_device

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

const long long INF = 2E18;

vector<long long> ve;
int n;
long long a, b, l, r, cyc, ans = 0;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> n >> a >> b;
    a /= __gcd(a, b + 1);
    if (INF / a >= b)
        cyc = a * b;
    else
        cyc = INF;
    while (n--)
    {
        cin >> l >> r;
        if (r - l + 1 >= cyc)
        {
            ve.push_back(0);
            ve.push_back(-cyc);
        }
        else
        {
            l %= cyc; r %= cyc;
            ve.push_back(l);
            ve.push_back(-r - 1);
            if (l > r)
            {
                ve.push_back(0);
                ve.push_back(-cyc);
            }
        }
    }
    sort(ve.begin(), ve.end(), [](const long long &a, const long long &b) {
        return abs(a) < abs(b);
    });
    int cnt = 0;
    for (int i = 0; i < ve.size(); i++)
    {
        if (cnt > 0)
            ans += abs(ve[i]) - abs(ve[i - 1]);
        cnt += ve[i] / abs(ve[i]);
    }
    cout << ans;
}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:44:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < ve.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