제출 #1220920

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1220920		overwatch9	Team Coding (EGOI24_teamcoding)	C++20	0 / 100	48 ms	29252 KiB

Main

// subtask 2
#include <bits/stdc++.h>
using namespace std;
const int maxn = 2e5 + 1;
int col[maxn];
vector <int> adj[maxn];
vector <vector <int>> grps, grps2;
int depth[maxn];
void dfs(int s, int d) {
    grps[d][col[s]]++;
    grps2[d][col[s]]++;
    depth[s] = d;
    for (auto i : adj[s]) {
        dfs(i, d+1);
    }
}
pair <int, int> ans;
queue <int> q;
pair <int, int> get_best(pair <int, int> a, pair <int, int> b) {
    if (a.first > b.first)
        return a;
    if (b.first > a.first)
        return b;
    if (a.second < b.second)
        return a;
    return b;
}
pair <int, int> dfs2(int s, int c, int d) {
    pair <int, int> res = {0, 0};
    if (col[s] == c)
        res.first++;
    else if (grps2[d][c] > 0) {
        res.first++;
        q.push(d);
        grps2[d][c]--;
        grps2[d][1-c]++;
        res.second++;
    } else if (d == 1)
        return {0, 0};
    for (auto i : adj[s]) {
        auto res2 = dfs2(i, c, d+1);
        res.first += res2.first;
        res.second += res2.second;
    }
    return res;
}
void reset_grps() {
    while (!q.empty()) {
        int x = q.front();
        q.pop();
        grps2[x][0] = grps[x][0];
        grps2[x][1] = grps[x][1];
    }
}
int main() {
    int n, k;
    cin >> n >> k;
    for (int i = 0; i < n; i++)
        cin >> col[i];
    for (int i = 1; i < n; i++) {
        int p;
        cin >> p;
        adj[p].push_back(i);
    }
    grps2 = grps = vector <vector <int>> (n+1, vector <int> (2));
    dfs(0, 0);
    for (int i = 0; i < n; i++) {
        if (col[i] == col[0])
            ans.first++;
    }
    for (auto i : adj[0]) {
        reset_grps();
        ans = get_best(ans, dfs2(i, col[i], 1));
        reset_grps();
        ans = get_best(ans, dfs2(i, 1-col[i], 1));
    }
    cout << ans.first << ' ' << ans.second << '\n';
}

• Subtask 1: 0 / 12
• Subtask 2: 0 / 19
• Subtask 3: 0 / 27
• Subtask 4: 0 / 23
• Subtask 5: 0 / 19