Submission #430956

#	Time	Username	Problem	Language	Result	Execution time	Memory
430956		tengiz05	Regions (IOI09_regions)	C++17	40 / 100	8071 ms	27412 KiB

regions

#include <bits/stdc++.h>
using i64 = long long;
int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    int n, m, q;
    std::cin >> n >> m >> q;
    std::vector<std::vector<int>> e(n), c(m);
    std::vector<int> a(n);
    std::cin >> a[0];
    for (int i = 1, p; i < n; i++) {
        std::cin >> p >> a[i];
        p--;
        e[p].push_back(i);
    }
    for (int i = 0; i < n; i++) {
        c[--a[i]].push_back(i);
    }
    std::vector<int> in(n), out(n);
    int timeStamp = 0;
    std::function<void(int)> dfs = [&](int u) {
        in[u] = timeStamp++;
        for (auto v : e[u]) {
            dfs(v);
        }
        out[u] = timeStamp;
    };
    dfs(0);
    auto is = [&](int u, int v) { return in[u] < in[v] && out[u] >= out[v]; };
    while (q--) {
        int r1, r2;
        std::cin >> r1 >> r2;
        r1--;
        r2--;
        int ans = 0;
        for (auto u : c[r1]) {
            for (auto v : c[r2]) {
                if (is(u, v)) {
                    ans++;
                }
            }
        }
        std::cout << ans << std::endl;
    }
    return 0;
}

• Subtask 1: 15 / 15
• Subtask 2: 25 / 85