Submission #659823

#	Time	Username	Problem	Language	Result	Execution time	Memory
659823		alexdumitru	Remittance (JOI19_remittance)	C++14	100 / 100	228 ms	36412 KiB

remittance

#include <bits/stdc++.h>

#define int long long

using namespace std;

const int NMAX = 1e6 + 5;

int n,i,j;
pair<int,int> a[NMAX];

void solve()
{
    cin>>n;
    for(i=1;i<=n;i++)
        cin>>a[i].first>>a[i].second;
    bool sum = 0;
    for(i=1;i<=n;i++)
        sum|=(a[i].second!=0);
    if(!sum)
    {
        for(i=1;i<=n;i++)
            if(a[i].first)
        {
            cout<<"No\n";
            return;
        }
        cout<<"Yes\n";
        return;
    }
    bool go = true;
    while(go)
    {
        go=false;
        for(i=1;i<=n;i++)
            if(a[i].first>a[i].second)
            {
                go=true;
                int x = (a[i].first-a[i].second+1)/2;
                a[i].first-=x*2;
                if(i<n)
                    a[i+1].first+=x;
                else a[1].first+=x;
            }
    }
    for(i=1;i<=n;i++)
        if(a[i].first!=a[i].second)
        {
            cout<<"No\n";
            return;
        }
    cout<<"Yes\n";
}

signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    solve();
    return 0;
}

• Subtask 1: 15 / 15
• Subtask 2: 40 / 40
• Subtask 3: 45 / 45