Submission #931644

#	Time	Username	Problem	Language	Result	Execution time	Memory
931644		vjudge1	Zagrade (COI17_zagrade)	C++17	10 / 100	4 ms	1260 KiB

zagrade

#include <bits/stdc++.h>
#define pb push_back
using namespace std;

const int N = 1000 + 10;

int n, b[N], ans;
string s;
bool mark[N];
vector<int> G[N];

void dfs(int v, int p, int sm) {
    if (sm < 0) return;
    if (sm == 0) ans++;
    for (auto e : G[v])
        if (e ^ p)
            dfs(e, v, sm + b[e]);
}

int main() {
    ios:: sync_with_stdio(0), cin.tie(0);
    cin >> n >> s;
    for (int i = 0; i < n; i++) b[i + 1] = (s[i] == '('? 1: -1);
    for (int i = 0; i < n - 1; i++) {
        int u, v;
        cin >> u >> v;
        G[u].pb(v);
        G[v].pb(u);
    }
    for (int i = 1; i <= n; i++)
        dfs(i, i, b[i]);
    cout << ans << endl;
}

• Subtask 1: 10 / 10
• Subtask 2: 0 / 30
• Subtask 3: 0 / 60