Submission #721453

#	Time	Username	Problem	Language	Result	Execution time	Memory
721453		Darren0724	Strange Device (APIO19_strange_device)	C++17	10 / 100	492 ms	16892 KiB

strange_device

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define all(x) x.begin(),x.end()
const int INF=9e18;

int32_t main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int t;cin>>t;
    int a,b;cin>>a>>b;
    int m=0;
    if(INF/a<b){
        m=INF;
    }
    else{
        m=a*b;
    }
    vector<pair<int,int>> v;
    for(int i=0;i<t;i++){
        int l,r;cin>>l>>r;
        if(r-l+1>=m){
            cout<<m<<endl;
            return 0;
        }
        if(r%m<l%m){
            v.push_back({l%m,m-1});
            v.push_back({0,r%m});
        }
        else{
            v.push_back({l%m,r%m});
        }
    }
    sort(all(v));
    int ans=0;
    int l=0;
    for(pair<int,int> p:v){
        p.first=max(p.first,l);
        if(p.second<p.first){
            continue;
        }
        ans+=(p.second-p.first+1);
        l=p.second+1;
    }
    cout<<ans<<endl;


    return 0;
}

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