제출 #646039

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
646039		Tenis0206	이상한 기계 (APIO19_strange_device)	C++11	5 / 100	627 ms	68888 KiB

strange_device

#include <bits/stdc++.h>
#define int long long

using namespace std;

int n,a,b;

vector<pair<int,int>> eves;

signed main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    cin>>n>>a>>b;
    for(int i=1;i<=n;i++)
    {
        int l,r;
        cin>>l>>r;
        if(r - l + 1 >= a * b)
        {
            cout<<a * b<<'\n';
            return 0;
        }
        l %= a * b;
        r %= a * b;
        if(l <= r)
        {
            eves.push_back({l,1});
            eves.push_back({r+1,-1});
        }
        else
        {
            eves.push_back({0,1});
            eves.push_back({r+1,-1});
            eves.push_back({l,1});
            eves.push_back({a*b,-1});
        }
    }
    sort(eves.begin(),eves.end());
    int nr = 0;
    int rez = 0;
    int last = 0;
    for(auto it : eves)
    {
        if(nr==0 && it.second==1)
        {
            last = it.first;
        }
        nr += it.second;
        if(nr==0 && it.second==-1)
        {
            rez += it.first - last;
        }
    }
    cout<<rez<<'\n';
    return 0;
}

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