Submission #680707

#	Time	Username	Problem	Language	Result	Execution time	Memory
680707		PoonYaPat	Potatoes and fertilizers (LMIO19_bulves)	C++14	100 / 100	211 ms	23056 KiB

bulves

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

int n;
ll a[500001],b[500001],d[500001],ans;
priority_queue<ll> q;

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    cin>>n;
    for (int i=1; i<=n; ++i) {
        cin>>a[i]>>b[i];
        d[i]=d[i-1]+a[i]-b[i];
    }

    if (d[1]>=0) q.push(d[1]), ans+=d[1];
    else q.push(0), ans-=d[1];

    for (int i=2; i<=n; ++i) {
        if (d[i]>=q.top()) q.push(d[i]), ans+=d[i];
        else {
            if (d[i]<0) ans-=d[i], d[i]=0;
            ans+=d[i];
            q.push(d[i]); q.push(d[i]); q.pop();
        }
    }

    //now ans is at x=Y-intersect(0), then it will be moved to x=d[n]
    while (!q.empty()) ans-=min(d[n],q.top()), q.pop();
    cout<<ans;
}

• Subtask 1: 24 / 24
• Subtask 2: 10 / 10
• Subtask 3: 20 / 20
• Subtask 4: 10 / 10
• Subtask 5: 36 / 36