Submission #659849

#	Time	Username	Problem	Language	Result	Execution time	Memory
659849		filiptudose7	Remittance (JOI19_remittance)	C++11	100 / 100	200 ms	16596 KiB

remittance

#include <bits/stdc++.h>
#define int long long
#define no {cout<<"No"; return 0;}
#define yes {cout<<"Yes"; return 0;}
using namespace std;
int a[1000005],b[1000005],s1,s2;
signed main()
{
    //freopen("rem.in","r",stdin);
    //freopen("rem.out","w",stdout);
    cin.sync_with_stdio(false);
    cin.tie(0);
    int n;
    cin>>n;
    for(int i=1; i<=n; ++i)
    {
        cin>>a[i]>>b[i];
        s1+=a[i];
        s2+=b[i];
    }
    while(s1>=s2)
    {
        bool modif=0;
        int add=0;
        for(int i=1; i<=n; ++i)
        {
            if(a[i]<=b[i])continue;
            int next = (i<n ? i+1 : 1);
            int add=(a[i]-b[i]+1)/2;
            if(a[i]<add*2)--add;
            a[i]-=2*add;
            a[next]+=add;
            modif|=(add>0);
        }
        if(!modif)break;
        for(int i=1; i<=n; ++i)s1+=a[i];
    }
    for(int i=1; i<=n; ++i)if(a[i]!=b[i])no;
    yes;
    return 0;
}

Compilation message (stderr)

remittance.cpp: In function 'int main()':
remittance.cpp:24:13: warning: unused variable 'add' [-Wunused-variable]
   24 |         int add=0;
      |             ^~~

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