Submission #209747

#	Time	Username	Problem	Language	Result	Execution time	Memory
209747		mhy908	Remittance (JOI19_remittance)	C++14	100 / 100	411 ms	36348 KiB

remittance

#include <bits/stdc++.h>
using namespace std;
typedef long long LL;
int n;
LL a[1000010], b[1000010];
bool ans=true, allz=true;
int main(){
    scanf("%d", &n);
    for(int i=0; i<n; i++){
        scanf("%lld %lld", &a[i], &b[i]);
        if(b[i])allz=false;
        if(a[i]!=b[i])ans=false;
    }
    /*if(allz){
        if(ans)puts("Yes");
        else puts("No");
        return 0;
    }*/
    while(1){
        bool flag=false;
        for(int i=0; i<n; i++){
            if(a[i]<=b[i])continue;
            LL temp=(a[i]-b[i]+1)/2;
            if(a[i]-temp*2<0)continue;
            a[i]-=temp*2;
            a[(i+1)%n]+=temp;
            flag=true;
        }
        for(int i=0; i<n; i++)assert(a[i]>=0);
        if(!flag)break;
    }
    for(int i=0; i<n; i++){
        if(a[i]!=b[i]){
            puts("No");
            return 0;
        }
    }
    puts("Yes");
}

Compilation message (stderr)

remittance.cpp: In function 'int main()':
remittance.cpp:8:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
remittance.cpp:10:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld %lld", &a[i], &b[i]);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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