Submission #466250

#	Time	Username	Problem	Language	Result	Execution time	Memory
466250		surgutti	Quality Of Living (IOI10_quality)	C++14	100 / 100	2005 ms	140248 KiB

quality

#include "quality.h"

#include <bits/stdc++.h>

using namespace std;

int rectangle(int R, int C, int H, int W, int Q[3001][3001]) {
    int l = 0, r = R * C + 1;
    
    static int c[3001][3001];

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

    while(r - l > 1) {
        int m = (l + r) >> 1;

        for(int i = R - 1; i >= 0; i--) {
            for(int j = C - 1; j >= 0; j--) {
                c[i][j] = c[i + 1][j] + c[i][j + 1] - c[i + 1][j + 1] + (Q[i][j] <= m);
            }
        }

        bool ok = true;

        for(int i = 0; i <= R - H; i++) {
            for(int j = 0; j <= C - W; j++) {
                if(c[i][j] - c[i + H][j] - c[i][j + W] + c[i + H][j + W] >= (H * W + 1) / 2) {
                    ok = false;
                }
            }
        }

        if(ok)  l = m;
        else    r = m;
    }

    return r;
}

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