Submission #932613

#	Time	Username	Problem	Language	Result	Execution time	Memory
932613		Programmer123	Keys (IOI21_keys)	C++17	37 / 100	3054 ms	30428 KiB

keys

#include <bits/stdc++.h>

std::vector<int> find_reachable(std::vector<int> r, std::vector<int> u, std::vector<int> v, std::vector<int> c) {
    std::vector<int> ans(r.size(), 0);
    int N = r.size();
    int M = u.size();
    std::vector<std::pair<int, int>> edges[N];//{dest, type}
    for (int i = 0; i < M; ++i) {
        edges[u[i]].emplace_back(v[i], c[i]);
        edges[v[i]].emplace_back(u[i], c[i]);
    }
    std::set<int> num[N];
    bool eliminated[N];
    for (int i = 0; i < N; ++i) {
        eliminated[i] = false;
    }
    int actual[N];
    for (int i = 0; i < N; ++i) {
        actual[i] = i;
    }
    for (int i = 0; i < N; ++i) {
        bool seen[N];
        for (int j = 0; j < N; ++j) {
            seen[j] = false;
        }
        seen[i] = true;
        std::set<int> found;
        std::vector<int> next[N];
        std::queue<int> bfs;
        bfs.push(i);
        int TMP_THING = 0;
        while (!bfs.empty()) {
            auto n = bfs.front();
            bfs.pop();
            if (!found.count(r[n])) {
                found.insert(r[n]);
                for (auto a: next[r[n]]) {
                    if (!seen[a]) {
                        if (a < i) {
                            TMP_THING = a;
                            goto elim;
                        }
                        seen[a] = true;
                        bfs.push(a);
                    }
                }
            }
            for (auto [x, t]: edges[n]) {
                if (seen[x]) continue;
                if (found.count(t)) {
                    if (x < i) {
                        TMP_THING = x;
                        goto elim;
                    }
                    seen[x] = true;
                    bfs.push(x);
                } else {
                    next[t].push_back(x);
                }
            }
        }
        for (int j = 0; j < N; ++j) {
            if (seen[j]) num[i].insert(j);
        }
        continue;
        elim:
        if (eliminated[TMP_THING]) {
            eliminated[i] = true;
        } else {
            TMP_THING = actual[TMP_THING];
            if (num[TMP_THING].count(i)) {
                actual[i] = TMP_THING;
            } else {
                eliminated[i] = true;
            }
        }
    }
    size_t min = INT_MAX;
    for (int i = 0; i < N; ++i) {
        if (eliminated[i]) continue;
        if (actual[i] != i) continue;
        min = std::min(min, num[i].size());
    }
    for (int i = 0; i < N; ++i) {
        if (eliminated[i]) continue;
        ans[i] = num[actual[i]].size() == min;
    }
    return ans;
}

• Subtask 1: 9 / 9
• Subtask 2: 11 / 11
• Subtask 3: 17 / 17
• Subtask 4: 0 / 30
• Subtask 5: 0 / 33