oj.uz

답안 #763836

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
763836 2023-06-22T23:55:02 Z Olympia Zagrade (COI17_zagrade) C++17
100 / 100
 1544 ms 98180 KB 
#include <iostream>
#include <cassert>
#include <cmath>
#include <set>
#include <map>
#include <stack>
#include <queue>
#include <ctime>
#include <set>
#include <algorithm>
#include <functional>
#include <iomanip>
#define ll long long
using namespace std;
vector<vector<int>> adj;
vector<bool> marked;
vector<int> sz;
map<pair<int,int>,ll> myMap;
vector<int> mySet;
map<int,ll> tot[(int)3e5];
int n;
string s;
ll cntr = 0;
int get (char c) {
    return ((c == '(') ? 1 : -1);
}
int find_centroid (int curNode, int prevNode, int net_sz) {
    for (int i: adj[curNode]) {
        if (i != prevNode and !marked[i] and sz[i] * 2 >= net_sz) {
            return find_centroid(i, curNode, net_sz);
        }
    }
    return curNode;
}
void solve (int root) { //this node is our centroid
    std::function<int(int, int)> get_sizes;
    get_sizes = [&get_sizes](int curNode, int prevNode) -> int {
        assert(!marked[curNode]);
        sz[curNode] = 1;
        for (int i: adj[curNode]) {
            if (i != prevNode and !marked[i]) {
                get_sizes(i, curNode);
                sz[curNode] += sz[i];
            }
        }
        return sz[curNode];
    };
    get_sizes(root, root);
    if (sz[root] == 1) {
        return;
    }
    int centroid = find_centroid(root, root, sz[root]);
    marked[centroid] = true;
    int tc = 2;
    while (tc--) {
        for (int x: mySet) {
            tot[x].clear();
        }
        mySet.clear();
        for (int node: adj[centroid]) {
            if (!marked[node]) {
                myMap.clear();
                std::function<void(int,int,int,int, int, int, int)> dfs;
                dfs = [&dfs](int curNode, int prevNode, int sm, int prefix1, int prefix2, int centroid, int tc) -> void {
                    if (sm <= 0) mySet.push_back(0 - sm);
                    myMap[make_pair(sm, prefix1)]++;
                    if (prefix2 >= 0 and sm + get(s[centroid]) >= 0 and tot[sm + get(s[centroid])].count(0 - get(s[centroid]) - sm)) {
                        cntr += tot[sm + get(s[centroid])][0 - get(s[centroid]) - sm] - myMap[make_pair(0 - sm - get(s[centroid]), 0 - get(s[centroid]) - sm)];
                    }
                    if (sm <= 0) tot[0 - sm][prefix1]++;
                    cntr += (sm == 1 and prefix2 == 0 and s[centroid] == ')') * (tc == 0);
                    cntr += (sm + get(s[centroid]) == 0 and prefix1 == -1 and s[centroid] == '(') * (tc == 0);
                    for (int i: adj[curNode]) {
                        if (i != prevNode and !marked[i]) {
                            dfs(i, curNode, sm + get(s[i]), min(min(prefix1, sm + get(s[i])), 0), min(min(prefix2 + get(s[i]), get(s[i])), 0), centroid, tc);
                        }
                    }
                };
                dfs(node, node, get(s[node]), min(0, get(s[node])), min(0, get(s[node])), centroid, tc);
            }
        }
        reverse(adj[centroid].begin(), adj[centroid].end());
    }
    for (int i: adj[centroid]) {
        if (!marked[i]) {
            solve(i);
        }
    }
}
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    //freopen("zagrade.in.3j.out", "r", stdin);
    //exit(0);
    cin >> n >> s;
    adj.resize(n);
    marked.assign(n, false), sz.resize(n);
    for (int i = 0; i < n - 1; i++) {
        int u, v;
        cin >> u >> v;
        --u, --v;
        auto add_edge = [&](int u, int v) {
            adj[u].push_back(v), adj[v].push_back(u);
        };
        add_edge(u, v);
    }
    solve(0);
    cout << cntr << '\n';
}

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 14420 KB Output is correct
2 Correct 7 ms 14424 KB Output is correct
3 Correct 7 ms 14420 KB Output is correct
4 Correct 7 ms 14420 KB Output is correct
5 Correct 7 ms 14420 KB Output is correct
6 Correct 7 ms 14436 KB Output is correct
7 Correct 7 ms 14484 KB Output is correct
8 Correct 7 ms 14420 KB Output is correct
9 Correct 7 ms 14420 KB Output is correct
10 Correct 7 ms 14484 KB Output is correct

Subtask #2
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 760 ms 66648 KB Output is correct
2 Correct 1391 ms 79080 KB Output is correct
3 Correct 735 ms 66016 KB Output is correct
4 Correct 1261 ms 77272 KB Output is correct
5 Correct 739 ms 65684 KB Output is correct
6 Correct 727 ms 66484 KB Output is correct
7 Correct 736 ms 66020 KB Output is correct
8 Correct 728 ms 66552 KB Output is correct
9 Correct 745 ms 65748 KB Output is correct
10 Correct 1500 ms 93920 KB Output is correct
11 Correct 431 ms 67484 KB Output is correct

Subtask #3
60.0 / 60.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 14420 KB Output is correct
2 Correct 7 ms 14424 KB Output is correct
3 Correct 7 ms 14420 KB Output is correct
4 Correct 7 ms 14420 KB Output is correct
5 Correct 7 ms 14420 KB Output is correct
6 Correct 7 ms 14436 KB Output is correct
7 Correct 7 ms 14484 KB Output is correct
8 Correct 7 ms 14420 KB Output is correct
9 Correct 7 ms 14420 KB Output is correct
10 Correct 7 ms 14484 KB Output is correct
11 Correct 760 ms 66648 KB Output is correct
12 Correct 1391 ms 79080 KB Output is correct
13 Correct 735 ms 66016 KB Output is correct
14 Correct 1261 ms 77272 KB Output is correct
15 Correct 739 ms 65684 KB Output is correct
16 Correct 727 ms 66484 KB Output is correct
17 Correct 736 ms 66020 KB Output is correct
18 Correct 728 ms 66552 KB Output is correct
19 Correct 745 ms 65748 KB Output is correct
20 Correct 1500 ms 93920 KB Output is correct
21 Correct 431 ms 67484 KB Output is correct
22 Correct 695 ms 37460 KB Output is correct
23 Correct 749 ms 37984 KB Output is correct
24 Correct 659 ms 37484 KB Output is correct
25 Correct 670 ms 37980 KB Output is correct
26 Correct 754 ms 47784 KB Output is correct
27 Correct 715 ms 42876 KB Output is correct
28 Correct 704 ms 41220 KB Output is correct
29 Correct 1544 ms 98172 KB Output is correct
30 Correct 1518 ms 98180 KB Output is correct
31 Correct 89 ms 37848 KB Output is correct
32 Correct 434 ms 71644 KB Output is correct