Submission #677963

#	Time	Username	Problem	Language	Result	Execution time	Memory
677963		arnold518	Remittance (JOI19_remittance)	C++17	100 / 100	256 ms	23888 KiB

remittance

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

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 1e6;

int N;
ll A[MAXN+10], B[MAXN+10], X[MAXN+10], S;

int main()
{
	scanf("%d", &N);
	for(int i=1; i<=N; i++) scanf("%lld%lld", &A[i], &B[i]), S+=B[i]-A[i];

	ll p=0, q=1;
	for(int i=1; i<=N; i++)
	{
		p+=q*(B[i]-A[i]);
		q*=2;
	}
	if(p%(q-1)!=0) return !printf("No\n");

	ll x=p/(1-q);
	for(int i=N; i>=1; i--)
	{
		x=x*2+B[i]-A[i];
		if(x<0) return !printf("No\n");
		X[i]=x;
	}

	for(int i=1; i<=N; i++) if(X[i]==0) return !printf("Yes\n");

	bool flag=false;
	for(int i=1; i<=N; i++) if(B[i]!=0) flag=true;
	if(!flag) return !printf("No\n");

	return !printf("Yes\n");

}

Compilation message (stderr)

remittance.cpp: In function 'int main()':
remittance.cpp:15:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |  scanf("%d", &N);
      |  ~~~~~^~~~~~~~~~
remittance.cpp:16:31: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |  for(int i=1; i<=N; i++) scanf("%lld%lld", &A[i], &B[i]), S+=B[i]-A[i];
      |                          ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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