Submission #731491

#	Time	Username	Problem	Language	Result	Execution time	Memory
731491		Desh03	Regions (IOI09_regions)	C++17	35 / 100	8032 ms	131072 KiB

regions

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

vector<vector<int>> r, g;
vector<int> euler, in, out, fr, c;
vector<vector<pair<int, int>>> q;
int t;

void dfs(int u) {
    in[u] = t++;
    euler.push_back(u);
    for (int v : g[u])
        dfs(v);
    out[u] = t - 1;
}

int main() {
    int n, rr, qq;
    cin >> n >> rr >> qq;
    g.resize(n), r.resize(rr), in.resize(n), out.resize(n), fr.resize(rr), c.resize(n), q.resize(qq);
    vector<vector<int>> ans(rr, vector<int> (rr));
    int x, h;
    cin >> h;
    h--;
    r[h].push_back(0);
    for (int i = 1; i < n; i++) {
        cin >> x >> h;
        x--, h--;
        r[h].push_back(i);
        g[x].push_back(i);
        c[i] = h;
    }
    dfs(0);
    for (int i = 0; i < rr; i++) {
        for (int u : r[i]) {
            for (int j = in[u] + 1; j <= out[u]; j++) fr[c[euler[j]]]++;
        }
        for (int j = 0; j < rr; j++) ans[i][j] = fr[j], fr[j] = 0;
    }
    while (qq--) {
        int a, b;
        cin >> a >> b;
        cout << ans[--a][--b] << endl;
    }
}

• Subtask 1: 15 / 15
• Subtask 2: 20 / 85