Submission #397747

#	Time	Username	Problem	Language	Result	Execution time	Memory
397747		KoD	Alternating Current (BOI18_alternating)	C++17	0 / 100	3068 ms	51964 KiB

alternating

#include <bits/stdc++.h>

using ll = long long;

template <class T>
using Vec = std::vector<T>;

using Bit = std::bitset<4100>;

std::random_device dev;
std::default_random_engine gen(dev() ^ std::clock());

int main() {
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(nullptr);
    int N, M, K;
    std::cin >> N >> M >> K;
    if (N <= 100 and M <= 100) {
        Vec<Vec<char>> S(N, Vec<char>(M));
        for (auto& v: S) {
            for (auto& x: v) {
                std::cin >> x;
            }
        }
        for (int i = 0; i < N; ++i) {
            bool ok = true;
            for (int j = 0; j < N; ++j) {
                if (i == j) continue;
                int cnt = 0;
                for (int k = 0; k < M; ++k) {
                    cnt += (S[i][k] != S[j][k]);
                }
                if (cnt != K) {
                    ok = false;
                    break;
                }
            }
            if (ok) {
                std::cout << i + 1 << '\n';
            }
        }
        return 0;
    }
    Vec<Bit> bit(N);
    for (auto& b: bit) {
        for (int i = 0; i < M; ++i) {
            char c;
            std::cin >> c;
            if (c == 'C') {
                b.set(i);
            }
        }
    }
    Vec<bool> good(N, true);
    Vec<int> order(N);
    std::iota(order.begin(), order.end(), 0);
    std::shuffle(order.begin(), order.end(), gen);
    Vec<Vec<int>> memo(N, Vec<int>(N));
    for (const auto i: order) {
        if (!good[i]) continue;
        for (const auto j: order) {
            if (i != j) {
                if (memo[i][j] == 0) {
                    memo[i][j] = ((int) (bit[i] ^ bit[j]).count() == K ? 1 : -1);
                }
                if (memo[i][j] == -1) {
                    good[i] = good[j] = false;
                    break;
                }
            }
        }
        if (good[i]) {
            std::cout << i + 1 << '\n';
        }
    }
    return 0;
}

• Subtask 1: 0 / 13
• Subtask 2: 0 / 20
• Subtask 3: 0 / 22
• Subtask 4: 0 / 19
• Subtask 5: 0 / 26