Submission #480479

#	Time	Username	Problem	Language	Result	Execution time	Memory
480479		pure_mem	Uzastopni (COCI15_uzastopni)	C++14	80 / 160	49 ms	23880 KiB

uzastopni

#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 = 10001, M = 100;
const ll mod = 1e9 + 7;

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

void dfs(int v) {
	for(int to: g[v])
		dfs(to);
	for(int i = M - 1;i >= 0;i--)
		q[i].clear();
	for(int to: g[v]) {
		for(pair<int, int> &nx: ans[to])
			q[nx.X].push_back(nx.Y);
	}
	q[cl[v]].push_back(cl[v]);
	for(int i = M - 1;i >= 0;i--) {
		for(int j: q[i]) {
			dp[v][i][j] = 1;
			if(j + 1 < M)
				dp[v][i] |= dp[v][j + 1];
		}
		if(i > cl[v]) continue;
		for(int j = cl[v];j < M;j++) {
			if(dp[v][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: 80 / 160