oj.uz

Submission #397395

# Submission time Handle Problem Language Result Execution time Memory
397395 2021-05-02T02:52:03 Z KoD Love Polygon (BOI18_polygon) C++17
25 / 100
 176 ms 12308 KB 
#include <bits/stdc++.h>

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

int main() {
    int N;
    std::cin >> N;
    if (N % 2 == 1) {
        std::cout << -1 << '\n';
        return 0;
    }
    Vec<int> to(N);
    {
        Vec<std::string> U(N), V(N);
        for (int i = 0; i < N; ++i) {
            std::cin >> U[i] >> V[i];
        }    
        auto cmp = U;
        std::sort(cmp.begin(), cmp.end());
        for (int i = 0; i < N; ++i) {
            const auto u = std::lower_bound(cmp.cbegin(), cmp.cend(), U[i]) - cmp.cbegin();
            const auto v = std::lower_bound(cmp.cbegin(), cmp.cend(), V[i]) - cmp.cbegin();
            to[u] = v;
        }
    }
    int use = 0;
    Vec<bool> used(N);
    for (int i = 0; i < N; ++i) {
        if (!used[i]) {
            if (to[i] == i) {
                used[i] = true;
            }
            else if (to[to[i]] == i) {
                use += 1;
                used[i] = true;
            }
        }
    }
    for (int i = 0; i < N; ++i) {
        if (!used[i]) {
            int cnt = 0;
            int u = i;
            while (!used[u]) {
                cnt += 1;
                used[u] = true;
                u = to[u];
            }
            use += cnt / 2;
        }
    }
    std::cout << N - use << '\n';
    return 0;
}

Subtask #1
0 / 21.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 208 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 176 ms 12236 KB Output is correct
5 Correct 172 ms 12100 KB Output is correct
6 Correct 176 ms 12308 KB Output is correct
7 Correct 1 ms 204 KB Output is correct

Subtask #3
0 / 29.0

# Verdict Execution time Memory Grader output
1 Incorrect 176 ms 12188 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 25.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 208 KB Output isn't correct
2 Halted 0 ms 0 KB -