제출 #346926

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
346926		blue	이상한 기계 (APIO19_strange_device)	C++17	100 / 100	1815 ms	26320 KiB

strange_device

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

long long long_gcd(long long a, long long b)
{
    // cout << "gcd " << a << ' ' << b << '\n';
    if(a < b) swap(a, b);
    if(b == 0) return a;
    return long_gcd(a%b, b);
}

long long long_abs(long long x)
{
    if(x >= 0) return x;
    return -x;
}

long long long_sign(long long x)
{
    if(x > 0) return 1;
    return -1;
}

int main()
{
    int n;
    long long A, B;
    cin >> n >> A >> B;



    long long period = A / long_gcd(A, B+1);

    if (period > 2e18 / B) { // period * B > 2e18
        period = 1'000'000'000'000'000'000LL;
    } else {
        period *= B;
    }

    // cout << period << '\n';

    long long l, r;

    long long maxSize = 0;

    vector<long long> endpoints;

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

        if(l % period <= r % period)
        {
            endpoints.push_back(l % period + 1);
            endpoints.push_back(-(r % period) - 1 - 1);
        }
        else
        {
            endpoints.push_back(l % period + 1);
            endpoints.push_back(-period - 1);

            endpoints.push_back(0 + 1);
            endpoints.push_back(-(r % period) - 1 - 1);
        }
    }

    if(maxSize >= period)
    {
        cout << period << '\n';
        return 0;
    }


        // for(long long e: endpoints) cout << e << ' ';
        // cout << '\n';


    sort(endpoints.begin(), endpoints.end(), [] (long long p, long long q)
    {
        return long_abs(p) < long_abs(q);
    });

    // for(long long e: endpoints) cout << e << ' ';
    // cout << '\n';


    long long res = 0;

    long long count = 0;
    count += long_sign(endpoints[0]);
    for(int i = 1; i < endpoints.size(); i++)
    {
        // cout << count << ' ' << long_abs(endpoints[i]) - long_abs(endpoints[i-1]) << '\n';
        if(count > 0) res += long_abs(endpoints[i]) - long_abs(endpoints[i-1]);
        count += long_sign(endpoints[i]);
    }

    cout << res << '\n';
}

컴파일 시 표준 에러 (stderr) 메시지

strange_device.cpp: In function 'int main()':
strange_device.cpp:94:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   94 |     for(int i = 1; i < endpoints.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