Submission #609904

#	Time	Username	Problem	Language	Result	Execution time	Memory
609904		penguinhacker	Remittance (JOI19_remittance)	C++17	100 / 100	220 ms	28580 KiB

remittance

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

#define ll long long
#define ar array

const int mxN=1e6;
int n, a[mxN], b[mxN];

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	cin >> n;
	for (int i=0; i<n; ++i)
		cin >> a[i] >> b[i];
	for (int i=0, change=0; change<n+2; i=i+1<n?i+1:0) {
		if (a[i]>b[i]&&a[i]>=2) {
			int x=(a[i]-b[i]+1)/2;
			if (a[i]-2*x<0)
				--x;
			assert(x);
			a[i+1<n?i+1:0]+=x;
			a[i]-=2*x;
			//cout << i << " " << x << endl;
			change=0;
		} else
			++change;
	}
	for (int i=0; i<n; ++i)
		if (a[i]!=b[i]) {
			cout << "No";
			return 0;
		}
	cout << "Yes";
	return 0;
}

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