oj.uz

답안 #529046

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
529046 2022-02-22T03:47:05 Z d2k05 Power Plant (JOI20_power) C++14
0 / 100
 16 ms 23812 KB 
#include <bits/stdc++.h>

#define fastio ios_base :: sync_with_stdio(0), cin.tie(0);

using namespace std;
using ll = long long;

const int mxN = 1e6 + 5, mod = 1e9 + 7;

int n, d[mxN], b[mxN], ans; string a;
vector <int> adj[mxN];

void calc(int v, int p = -1) {
	for (auto to : adj[v]) {
		if (to != p) calc(to, v), d[v] += d[to], b[v] |= b[to];
	}
	d[v] += a[v - 1] * (b[v] > 0 ? -1 : 1);
	b[v] |= a[v - 1];
	if (!d[v]) 
		d[v] = b[v] = a[v - 1];
}

void dfs(int v, int p = -1) {
	int cnt = 0, h = 0;
	for (auto to : adj[v])
		cnt += d[to], h += b[to];
	ans = max(ans, (int)a[v - 1]);
	ans = max(ans, cnt + (h > 0 ? -a[v - 1] : a[v - 1]));
	for (auto to : adj[v]) {
		if (to != p) {
			int dv = d[v], dto = d[to];
			int bv = b[v], bto = b[to];
			d[v] -= d[to];
			if (d[v] <= 1) {
				if (a[v - 1])
					d[v] = b[v] = 1;
				else {
					if (d[v] <= 0)
						b[v] = 0;
				}
			}
			if (d[to] == 1 && a[to - 1] == 1) 
				d[to] = b[to] = 0;
			d[to] += d[v]; b[to] |= b[v];
			d[to] += a[to - 1] * (b[to] > 0 ? -1 : 1);
			b[to] |= a[to - 1];
			if (!d[to])
				d[to] = b[to] = a[to - 1];
			dfs(to, v);
			d[v] = dv, d[to] = dto, b[v] = bv, b[to] = bto;
		}
	}
}

int main() {
	fastio;
	cin >> n;
	for (int i = 1, u, v; i < n; ++i) {
		cin >> u >> v;
		adj[u].push_back(v);
		adj[v].push_back(u);
	}
	cin >> a;
	for (auto &x : a) x -= '0';
	calc(1); dfs(1);
	cout << ans;
	return 0;
}

Subtask #1
0.0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 23756 KB Output is correct
2 Correct 12 ms 23756 KB Output is correct
3 Correct 12 ms 23756 KB Output is correct
4 Correct 16 ms 23756 KB Output is correct
5 Correct 12 ms 23800 KB Output is correct
6 Correct 12 ms 23812 KB Output is correct
7 Correct 12 ms 23780 KB Output is correct
8 Incorrect 12 ms 23804 KB Output isn't correct
9 Halted 0 ms 0 KB -

Subtask #2
0.0 / 41.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 23756 KB Output is correct
2 Correct 12 ms 23756 KB Output is correct
3 Correct 12 ms 23756 KB Output is correct
4 Correct 16 ms 23756 KB Output is correct
5 Correct 12 ms 23800 KB Output is correct
6 Correct 12 ms 23812 KB Output is correct
7 Correct 12 ms 23780 KB Output is correct
8 Incorrect 12 ms 23804 KB Output isn't correct
9 Halted 0 ms 0 KB -

Subtask #3
0.0 / 53.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 23756 KB Output is correct
2 Correct 12 ms 23756 KB Output is correct
3 Correct 12 ms 23756 KB Output is correct
4 Correct 16 ms 23756 KB Output is correct
5 Correct 12 ms 23800 KB Output is correct
6 Correct 12 ms 23812 KB Output is correct
7 Correct 12 ms 23780 KB Output is correct
8 Incorrect 12 ms 23804 KB Output isn't correct
9 Halted 0 ms 0 KB -