제출 #755653

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
755653		MISM06	송금 (JOI19_remittance)	C++14	0 / 100	1 ms	340 KiB

remittance

//0 1 1 0 1
//0 1 0 0 1
//1 0 0 1 1
//0 1 1 0 1
#include <bits/stdc++.h>
#pragma GCC optimize("Ofast,unroll-loops")
#pragma GCC target("avx2")

using namespace std;

#define F 			first
#define S 			second
#define pb 			push_back
#define sze			size()
#define	all(x)		x.begin() , x.end()
#define wall__		cout << "--------------------------------------\n";
#define kids		int mid = (tl + tr) >> 1, cl = v << 1, cr = v << 1 | 1
#define file_io		freopen("input.cpp", "r", stdin); freopen("output.cpp", "w", stdout);

typedef long long ll;
typedef long double dl;
typedef pair < int , int > pii;
typedef pair < int , ll > pil;
typedef pair < ll , int > pli;
typedef pair < ll , ll > pll;
typedef pair < int , pii > piii;
typedef pair < ll, pll > plll;


const ll N = 1e6 + 10;
const ll mod = 1e9 + 7;
const ll inf = 2e16;
const ll rinf = -2e16;
const ll INF = 1e9 + 10;
const ll rINF = -1e9 - 10;
const ll lg = 32;

ll a[N], b[N], n;
int mark[N];

bool be_lock (int idx) {
	if (a[idx] <= b[idx] + 1ll) return true;
	return false;
}

void solve () {

	cin >> n;
	ll s = 0;
	for (int i = 0; i < n; i++) {
		cin >> a[i] >> b[i];
		s += a[i]; s -= b[i];
	}
	int lock = 0;
	int i = 0;
	while (s > 0 && lock < n) {
		ll x = a[i] - b[i]; 
		s -= a[i]; s -= a[(i + 1) % n];
		if (x > 0) {
			x /= 2ll;
			a[i] -= (2ll * x);
			a[(i + 1) % n] += x;
		}
		s += a[i];
		s += a[(i + 1) % n];
		int t = be_lock(i);
		lock -= mark[i]; lock += t;
		t = be_lock((i + 1) % n);
		lock -= mark[(i + 1) % n]; lock += t; 
		mark[i] = t; mark[(i + 1) % n] = t;
		++i; i %= n;
	}
	int c = 0;
	for (int i = 0; i < n; i++) {
		if (a[i] != b[i]) ++c;
	}
	if (c) cout << "No\n";
	else cout << "Yes\n";

}


int main() {
	ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	
	int t = 1;
	// cin >> t;
	while (t--) {solve();}
    return 0;
}
/*
5
0 0
1 2
2 4
3 2
4 0
*/
//shrek will AC this;

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