Submission #897274

#	Time	Username	Problem	Language	Result	Execution time	Memory
897274		NK_	Remittance (JOI19_remittance)	C++17	0 / 100	1 ms	604 KiB

remittance

// Success consists of going from failure to failure without loss of enthusiasm
#include <bits/stdc++.h>

using namespace std;

#define nl '\n'

using ll = long long;
template<class T> using V = vector<T>;
using vi = V<int>;
using vl = V<ll>;

const int K = 3;
array<int, K> MOD = {int(1e9) + 7, int(1e9) + 9, 1009};
array<ll, K> EMP = {0, 0, 0};


int main() {
	cin.tie(0)->sync_with_stdio(0);
	
	int N; cin >> N;
	vl A(N); for(int i = 0; i < N; i++) {
		ll x; cin >> x; A[i] = x;
		cin >> x; A[i] -= x;
	}

	auto POW = [&](ll a, ll p, int m) {
		ll ans = 1; 
		for(; p; p /= 2, a = (a * a) % m) if (p % 2) ans = (ans * a) % m;
		return ans;
	};

	auto ADD = [&](ll &a, ll b, int m) { return (a + b) % m; };
	auto SUB = [&](ll &a, ll b, int m) { return (a - b + m) % m; };
	auto MUL = [&](ll &a, ll b, int m) { return (a * b) % m; };

	array<ll, K> cur = {0, 0, 0};
	for(int i = N - 1; i >= 0; i--) {
		for(int k = 0; k < K; k++) cur[k] = ADD(cur[k], MUL(A[i], POW(2, N - 1 - i, MOD[k]), MOD[k]), MOD[k]);
	} 

	bool ans = (cur == EMP);
	for(int i = 0; i < N; i++) {
		for(int k = 0; k < K; k++) {
			cur[k] = SUB(cur[k], MUL(A[i], POW(2, N - 1, MOD[k]), MOD[k]), MOD[k]);
			cur[k] = MUL(cur[k], 2, MOD[k]);
			cur[k] = ADD(cur[k], A[i], MOD[k]);
			ans |= (cur == EMP);
		}
	}

	cout << (ans ? "Yes" : "No") << nl;

	exit(0-0);
}

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