제출 #797345

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
797345		finn__	Diversity (CEOI21_diversity)	C++17	0 / 100	1 ms	468 KiB

diversity

#pragma GCC optimize("Ofast")
#pragma GCC target("avx,avx2,sse4")

#include <bits/stdc++.h>
using namespace std;

constexpr size_t N = 300000, M = 300000;

uint64_t f[2][N], s[M], p[M];

template <typename T>
T gauss(T n) { return (n * (n + 1)) / 2; }

template <typename T>
T range_gauss(T a, T b)
{
    return gauss(b) - (a ? gauss(a - 1) : 0);
}

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    size_t n, q;
    cin >> n >> q;
    size_t m;
    for (size_t i = 0; i < n; ++i)
    {
        size_t a;
        cin >> a;
        s[a - 1]++;
        m = max(m, a - 1);
    }

    sort(s, s + m);
    partial_sum(s, s + m, p);
    memset(f, 255, sizeof f);
    f[0][0] = 0;

    for (size_t j = 0; j < m; ++j)
    {
        size_t const u = j & 1, v = (j & 1) ^ 1;
        memset(f[v], 255, sizeof f[v]);
        for (size_t i = 0; i <= (j ? p[j - 1] : 0); ++i)
            if (f[u][i] != UINT64_MAX)
            {
                // Extend left
                uint64_t l = i, r = l + s[j] - 1;
                f[v][i + s[j]] = min(f[v][i + s[j]], f[u][i] + (r + 1) * n - l * l - range_gauss(l, r));

                // Extend right
                r = n - ((j ? p[j - 1] : 0) - i) - 1, l = r - s[j] + 1;
                f[v][i] = min(f[v][i], f[u][i] + (r + 1) * n - l * l - range_gauss(l, r));
            }
    }

    uint64_t ans = UINT64_MAX;
    for (size_t i = 0; i < n; ++i)
        ans = min(ans, f[m & 1][i]);
    cout << ans << '\n';
}

컴파일 시 표준 에러 (stderr) 메시지

diversity.cpp: In function 'int main()':
diversity.cpp:41:26: warning: 'm' may be used uninitialized in this function [-Wmaybe-uninitialized]
   41 |     for (size_t j = 0; j < m; ++j)
      |                        ~~^~~

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