Submission #358520

#	Time	Username	Problem	Language	Result	Execution time	Memory
358520		idk321	Quality Of Living (IOI10_quality)	C++98	100 / 100	2791 ms	144876 KiB

quality

#include "quality.h"

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



int r, c, h, w, q[3001][3001];
int add[3001][3001];





bool good()
{
    for (int i = 0; i + h - 1 < r; i++)
    {
        for (int j = 0; j + w - 1 < c; j++)
        {
            int sum = add[i + h - 1][j + w - 1];
            if (i != 0) sum -= add[i - 1][j + w - 1];
            if (j != 0) sum -= add[i  + h - 1][j - 1];
            if (i != 0 && j != 0) sum += add[i - 1][j - 1];
            if (sum >= (h * w - 1) / 2 + 1) return true;
        }
    }

    return false;
}

void make(int num)
{

    for (int i = 0; i < r; i++)
    {
        for (int j = 0; j < c; j++) add[i][j] = 0;
    }

    for (int i = 0; i < r; i++)
    {
        for (int j = 0; j < c; j++)
        {
            if (q[i][j] <= num) add[i][j] = 1;
            if (i != 0) add[i][j] += add[i - 1][j];
            if (j != 0) add[i][j] += add[i][j - 1];
            if (i != 0 && j != 0) add[i][j] -= add[i - 1][j - 1];
        }
    }
}

int bs()
{
    int a = 0;
    int b = r * c;
    int res = -1;
    while (a <= b)
    {
        int mid = (a + b) / 2;
        make(mid);
        if (good())
        {
            res = mid;
            b = mid - 1;
        } else a = mid + 1;
    }

    return res;
}


int rectangle(int R, int C, int H, int W, int Q[3001][3001]) {
    r = R;
    c = C;
    h = H;
    w = W;
    for (int i = 0; i < 3001; i++)
    {
        for (int j = 0; j < 3001; j++) q[i][j] = Q[i][j];
    }





	return bs();
}

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