Submission #797258

#	Time	Username	Problem	Language	Result	Execution time	Memory
797258		fatemetmhr	Remittance (JOI19_remittance)	C++17	0 / 100	1083 ms	340 KiB

remittance

// Be name khoda // 

#include <bits/stdc++.h>

#define all(x) x.begin(), x.end()
#define pb     push_back
#define fi     first
#define se     second
#define mp     make_pair

typedef long long ll;

using namespace std;

const int maxn5 = 1e6 + 10;
const ll inf    = 1e18;

bool mark[maxn5];
ll a[maxn5], b[maxn5];
queue <int> q;

int n;
bool found = false;


void solve(){
	bool re = true;
	for(int i = 0; i < n; i++)
		re &= (a[i] == b[i]);
	if(re){
		found = true;
		return;
	}
	for(int i = 0; i < n; i++) for(int x = 2; x <= a[i]; x+= 2){
		a[i] -= x;
		a[(i + 1)%n] += x / 2;
		solve();
		if(found)
			return;
		a[i] += x;
		a[(i + 1)%n] -= x / 2;
	}

}

int main(){
	ios_base::sync_with_stdio(false); cin.tie(0);

	cin >> n;
	ll sum = 0;
	for(int i = 0; i < n; i++){
		cin >> a[i] >> b[i];
		sum += a[i];
	}
	solve();
	cout << (found ? "Yes" : "No") << endl;
	return 0;
	while(sum > 0){
		bool re = true;
		for(int i = 0; i < n; i++){
			if(a[i] < b[i]){
				int j = (i - 1 + n) % n;
				sum -= b[i] - a[i];
				a[j] -= 2 * (b[i] - a[i]);
				a[i] = b[i];
				re = false;
			}
			else if(a[i] > b[i]){
				int j = (i + 1) % n;
				ll w = (a[i] - b[i]) / 2 + ((a[i] - b[i]) % 2);
				a[j] += w;
				a[i] -= 2 * w;
				sum -= w;
				re = false;
			}
		}
		if(re)
			return cout << "Yes" << endl, 0;
	}
	cout << "No" << endl;

}

• Subtask 1: 0 / 15
• Subtask 2: 0 / 40
• Subtask 3: 0 / 45