Submission #1213497

#	Time	Username	Problem	Language	Result	Execution time	Memory
1213497		vanea	Regions (IOI09_regions)	C++20	0 / 100	149 ms	196608 KiB

regions

#include <bits/stdc++.h>
using namespace std;
using ll = long long;

const int mxN = 2e5+10;
const int mxR = 5e2+10;

int reg[mxN];
vector<int> adj[mxN];
int ans[mxR][mxR];
int dp[mxN][mxR];

void dfs(int node, int p) {
    dp[node][reg[node]]++;
    for(auto it : adj[node]) {
        if(it == p) continue;
        dfs(it, node);
        for(int i = 1; i <= 500; i++) {
            dp[node][i] += dp[it][i];
        }
    }
    for(int i = 1; i <= 500; i++) {
        ans[reg[node]][i] += dp[node][i];
    }
}

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n, r, q;
    cin >> n >> r >> q;
    cin >> reg[1];
    for(int i = 2; i <= n; i++) {
        int p;
        cin >> p >> reg[i];
        adj[p].push_back(i);
        adj[i].push_back(p);
    }
    dfs(1, 0);
    while(q--) {
        int r1, r2;
        cin >> r1 >> r2;
        cout << ans[r1][r2] << '\n';
    }
    return 0;
}

• Subtask 1: 0 / 15
• Subtask 2: 0 / 85