Submission #520456

#	Time	Username	Problem	Language	Result	Execution time	Memory
520456		KoD	Diversity (CEOI21_diversity)	C++17	64 / 100	188 ms	16436 KiB

diversity

#include <bits/stdc++.h>

using std::vector;
using std::array;
using std::pair;
using std::tuple;

using i64 = std::int64_t;

constexpr i64 INF = std::numeric_limits<i64>::max() / 2;

template <class T> void setmin(T& lhs, const T& rhs) {
    if (lhs > rhs) {
        lhs = rhs;
    }    
}

int main() {
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(nullptr);
    int N, Q;
    std::cin >> N >> Q;
    vector<int> A(N);
    std::map<int, int> count;
    for (auto& x : A) {
        std::cin >> x;
        count[x] += 1;
    }
    vector<int> block;
    for (const auto& [_, c] : count) {
        block.push_back(c);
    }
    std::sort(block.begin(), block.end());
    const int n = block.size();
    i64 ans = (i64)N * (N + 1) / 2;
    int left = 0, right = 0;
    for (int i = 0; i < n - 1; ++i) {
        if (left < right) {
            left += block[i];
            ans += (i64)left * (N - left); 
        } else {
            right += block[i];
            ans += (i64)right * (N - right);
        }
    }
    std::cout << ans << '\n';
    return 0;
}

• Subtask 1: 4 / 4
• Subtask 2: 10 / 10
• Subtask 3: 8 / 8
• Subtask 4: 16 / 16
• Subtask 5: 26 / 26
• Subtask 6: 0 / 36