Submission #252135

#	Time	Username	Problem	Language	Result	Execution time	Memory
252135		Sugardorj	Strange Device (APIO19_strange_device)	C++14	100 / 100	2676 ms	63224 KiB

strange_device

#include <bits/stdc++.h>
using namespace std;
long long i,j,a,b,tt;
long long x,r,m,n,s,t,k,l,y,z;
set <pair<long long,long long>> p,c,d,e;
int main(){
    cin >> n>>a>>b;
    m = a/__gcd(a,b+1);
    if (m >1000000000000000000/b)
        m = 1000000000000000001;
    else m*=b;
    a=m;
    for (i = 0; i<n; i ++){
        cin >>x>>y;
        if (y-x+1>=a){
            cout << a;
            return 0;
        }
        x%=a;
        y%=a;
        if (x <=y){
            p.insert({x,y});
        }
        else {
            p.insert({0,y});
            p.insert({x,a-1});
        }
    }
    t = -1;
    while (p.size()){
        auto u=*p.begin();
        p.erase(*p.begin());
        x=u.first;
        y=u.second;
        t=max(t,x-1);
        s+=max(y-t,0ll);
        t=max(y,t);
    }
    cout <<s;
    return 0;
}

• 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