Submission #1267545

#	Time	Username	Problem	Language	Result	Execution time	Memory
1267545		ti24dung_nt	Quality Of Living (IOI10_quality)	C++20	100 / 100	987 ms	106112 KiB

quality

#include "quality.h"

int a[3001][3001], sum[3001][3001], ans;
int rectangle(int row, int col, int hig, int wid, int q[][3001])
{
    int l = 1e9, r = -1e9;
    for(int i = 0; i < row; ++i)
    {
        for(int j = 0; j < col; ++j)
        {
            if(l > q[i][j]) l = q[i][j];
            if(r < q[i][j]) r = q[i][j];
        }
    }
    
    while(l <= r)
    {
        int mid = (l + r) / 2;

        for(int i = 1; i <= row; ++i)
        {
            for(int j = 1; j <= col; ++j)
            {
                if(q[i - 1][j - 1] <= mid) a[i][j] = 1;
                else a[i][j] = -1;
            }
        }

        for(int i = 1; i <= row; ++i)
        {
            for(int j = 1; j <= col; ++j)
            {
                sum[i][j] = sum[i - 1][j] + sum[i][j - 1] - sum[i - 1][j - 1] + a[i][j];
            }
        }

        bool check = false;
        for(int x1 = 1; x1 <= row - hig + 1; ++x1)
        {
            for(int y1 = 1; y1 <= col - wid + 1; ++y1)
            {
                int x2 = x1 + hig - 1, y2 = y1 + wid - 1;
                int res = sum[x2][y2] - sum[x1 - 1][y2] - sum[x2][y1 - 1] + sum[x1 - 1][y1 - 1];
                if(res > 0) check = true;
                if(check) break;
            }
            if(check) break;
        }

        if(check)
        {
            ans = mid;
            r = mid - 1;
        }
        else l = mid + 1;
    }

    return ans;

}

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