Submission #1174520

#	Time	Username	Problem	Language	Result	Execution time	Memory
1174520		nuutsnoynton	Uzastopni (COCI15_uzastopni)	C++20	56 / 160	45 ms	10568 KiB

uzastopni

#include<bits/stdc++.h>

using namespace std;
using ll = long long;
const ll N = 1e3 + 10;
ll dp[N][102][102];
ll c[N];
vector < ll > adj[N];

void Go(ll node, ll par) {
	ll j, r, sz, pd[102][102] ={0};
	for ( ll chi : adj[node]) {
		if ( chi == par) continue;
		Go(chi, node);
		for ( j= 1; j <= 100; j ++) {
			for ( r = j; r <= 100; r ++) {
				pd[j][r] += dp[chi][j][r];
			}
		}
	}
	for ( sz = 1; sz <= 100; sz ++) {
		for ( j = 1; j <= 100; j ++) {
			for ( r = 1;  r< sz; r ++) {
				if ( j + sz - 1 > 100) continue;
				pd[j][j + sz  - 1] = pd[j][j + sz - 1] + (pd[j][j + r - 1] * pd[j + r][j + sz - 1]);
			}
		}
	}
	ll p = c[node];
	for ( j= p; j >= 1; j --) {
		for ( r = p; r <= 100; r ++) {
			if(  r== p && j == p) {
				dp[node][j][r] = 1;
				continue;
			}
			if ( r == p) {
				dp[node][j][r] = pd[j][p - 1];
				continue;
			}
			if ( j == p) {
				dp[node][j][r] = pd[p + 1][r];
				continue;
			}
			
			dp[node][j][r] = pd[j][p - 1] * pd[p + 1][r];
		}
	}
}

int main() {
	ll n, m, r, x, y, i, j, ans, t;
	
	cin >> n;
	for (i = 1; i <= n; i++) {
		cin >> c[i];
	}
	
	for (i = 1; i < n; i ++) {
		cin >> x >> y;
		adj[x].push_back(y);
		adj[y].push_back(x);
	}	
	
	Go(1, 1);
	ans = 0;
	for (i = 1; i<= 100; i ++){
		for (j = i; j <= 100; j ++) {
			ans += dp[1][i][j];
		}
	}
	cout << ans << endl;


}

• Subtask 1: 56 / 160