Submission #147781

#	Time	Username	Problem	Language	Result	Execution time	Memory
147781		Bodo171	Remittance (JOI19_remittance)	C++14	100 / 100	349 ms	36420 KiB

remittance

#include <iostream>

using namespace std;
const int nmax=1000*1000+5;
long long a[nmax],b[nmax];
long long sumA,sumB;
int n,i;
int main()
{
    ios_base::sync_with_stdio(false);
    cin>>n;
    for(i=0;i<n;i++)
    {
        cin>>a[i]>>b[i];
        sumA+=a[i];sumB+=b[i];
    }
    if(!sumB)
    {
        if(!sumA) cout<<"Yes";
        else cout<<"No";
        return 0;
    }
    for(bool change=1;change;)
    {
        change=0;
        for(i=0;i<n;i++)
            if(a[i]>b[i])
        {
            long long dif=(a[i]-b[i]+1)/2;
            a[i]-=2*dif;
            a[(i+1)%n]+=dif;
            change=1;
        }
    }
    bool bun=1;
    for(i=0;i<n;i++)
        bun&=(a[i]==b[i]);
    if(bun) cout<<"Yes";
    else cout<<"No";
    return 0;
}

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