Submission #207500

#	Time	Username	Problem	Language	Result	Execution time	Memory
207500		brcode	Strange Device (APIO19_strange_device)	C++14	100 / 100	2260 ms	53428 KiB

strange_device

#include <iostream>
#include <bits/stdc++.h>
using namespace std;
vector<pair<long long,long long>> seg;
int main(){
    long long n,a,b;
    cin>>n>>a>>b;
    a/=__gcd(a,b+1);
    long long mx = 1e18;
    if(mx/a<=b){
        mx = 1e18;
    }else{
        mx = a*b;
    }
    
    for(int i=0;i<n;i++){
        long long l,r;
        cin>>l>>r;
        
        if(r-l+1>=mx){
            cout<<mx<<endl;
            return 0;
        }
        l%=mx;
        r%=mx;
        if(l<=r){
            seg.push_back(make_pair(l,r));
        }else{
            seg.push_back(make_pair(l,mx-1));
            seg.push_back(make_pair(0,r));
        }
    }
    sort(seg.begin(),seg.end());
    long long ans = 0;
    long long l = seg[0].first;
    long long r = seg[0].second;
    for(auto x:seg){
        if(r<x.first){
            ans+=r-l+1;
            l=x.first;
            r=x.second;
        }else{
            r= max(r,x.second);
        }
       
    }
     ans+=(r-l+1);
    cout<<ans<<endl;
    
}

• 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