oj.uz

답안 #480495

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
480495 2021-10-16T16:02:28 Z pure_mem Uzastopni (COCI15_uzastopni) C++14
160 / 160
 117 ms 7748 KB 
// #pragma GCC optimize ("Ofast")
// #pragma GCC target ("avx2")

#include <bits/stdc++.h>

#define X first
#define Y second
#define ll long long 
#define MP make_pair

using namespace std;

const int N = 1e4 + 1, M = 100;
const ll mod = 1e9 + 7;

int n, cl[N];
vector<int> g[N];
vector< pair<int, int> > ans[N]; 
bitset<M> dp[M], tmp;

void dfs(int v) {
	for(int to: g[v])
		dfs(to);
	for(int i = M - 1;i >= 0;i--)
		dp[i].reset();
	for(int to: g[v]) {
		for(pair<int, int> &nx: ans[to]) {
			if(nx.X <= cl[v] && cl[v] <= nx.Y) continue;
			dp[nx.X][nx.Y] = 1;
		}
	}
	dp[cl[v]].reset();
	for(int i = M - 1;i >= 0;i--) {
		if(i == cl[v]) {
			if(i + 1 < M) dp[i] = dp[i + 1];
			dp[i][i] = 1;
		}
		else {
			for(int j = M - 1;j >= i;j--) {
				if(i <= cl[v] && cl[v] <= j) continue;
				if(dp[i][j] && j + 1 < M) {
					dp[i] |= dp[j + 1]; 
				}
			}
		}
		if(i > cl[v]) continue;
		for(int j = cl[v];j < M;j++)
			if(dp[i][j]) ans[v].push_back(MP(i, j));
	}
}

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0), cout.tie(0);

	cin >> n;
	for(int i = 1;i <= n;i++)
		cin >> cl[i], cl[i]--;
	for(int i = 1, x, y;i < n;i++) {
		cin >> x >> y;
		g[x].push_back(y);
	} 
	dfs(1);
	cout << ans[1].size();
	return 0;
}

Subtask #1
160.0 / 160.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 716 KB Output is correct
2 Correct 1 ms 716 KB Output is correct
3 Correct 2 ms 716 KB Output is correct
4 Correct 2 ms 716 KB Output is correct
5 Correct 2 ms 716 KB Output is correct
6 Correct 2 ms 716 KB Output is correct
7 Correct 2 ms 716 KB Output is correct
8 Correct 2 ms 716 KB Output is correct
9 Correct 2 ms 716 KB Output is correct
10 Correct 2 ms 716 KB Output is correct
11 Correct 98 ms 1244 KB Output is correct
12 Correct 104 ms 1268 KB Output is correct
13 Correct 104 ms 1264 KB Output is correct
14 Correct 117 ms 7620 KB Output is correct
15 Correct 116 ms 7748 KB Output is correct
16 Correct 114 ms 7620 KB Output is correct
17 Correct 115 ms 1448 KB Output is correct
18 Correct 101 ms 1308 KB Output is correct
19 Correct 107 ms 3524 KB Output is correct
20 Correct 110 ms 3592 KB Output is correct