Submission #420218

#	Time	Username	Problem	Language	Result	Execution time	Memory
420218		Lam_lai_cuoc_doi	Quality Of Living (IOI10_quality)	C++17	100 / 100	1960 ms	140136 KiB

quality

#include <bits/stdc++.h>

using namespace std;
using ll = long long;
using ld = long double;
using ull = unsigned long long;

constexpr bool typetest = 0;
constexpr int N = 4e5 + 2;
//#include "grader.h"
//#include "quality.h"

int b[3001][3001];

int rectangle(int m, int n, int h, int w, int a[3001][3001])
{
    auto Check = [&](int v)
    {
        for (int i = 1; i <= m; ++i)
            for (int j = 1; j <= n; ++j)
                b[i][j] = (a[i - 1][j - 1] >= v) + b[i - 1][j] + b[i][j - 1] - b[i - 1][j - 1];

        for (int i = h; i <= m; ++i)
            for (int j = w; j <= n; ++j)
                if ((b[i][j] - b[i - h][j] - b[i][j - w] + b[i - h][j - w]) < (h * w + 1) / 2)
                    return false;

        return true;
    };

    int l = 1, mid, r = m * n;

    while (l <= r)
    {
        mid = (l + r) / 2;

        if (Check(mid))
            l = mid + 1;
        else
            r = mid - 1;
    }

    return r;
}

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 20 / 20
• Subtask 5: 20 / 20