Submission #1101086

#	Time	Username	Problem	Language	Result	Execution time	Memory
1101086		SulA	Quality Of Living (IOI10_quality)	C++17	100 / 100	2033 ms	140476 KiB

quality

#include <bits/stdc++.h>
#include "quality.h"
#include "grader.h"
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define bitcount __builtin_popcountll
using namespace std;
using namespace __gnu_pbds;
using namespace chrono;

int rectangle(int n, int m, int h, int w, int a[3001][3001]) {
    auto check = [&](int x) {
        vector<vector<int>> g(n, vector<int>(m, 0));
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < m; j++) {
                g[i][j] = a[i][j] <= x ? 1 : -1;
                if (i != 0) g[i][j] += g[i-1][j];
                if (j != 0) g[i][j] += g[i][j-1];
                if (i != 0 && j != 0) g[i][j] -= g[i-1][j-1];
            }
        }
        auto sum = [&](int x1, int y1, int x2, int y2) {
            int sum = g[x2][y2];
            if (x1 != 0) sum -= g[x1 - 1][y2];
            if (y1 != 0) sum -= g[x2][y1 - 1];
            if (x1 != 0 && y1 != 0) sum += g[x1 - 1][y1 - 1];
            return sum;
        };
        int mx = -h*w;
        for (int x1 = 0, x2 = h-1; x2 < n; x1++, x2++) {
            for (int y1 = 0, y2 = w-1; y2 < m; y1++, y2++) {
                int s = sum(x1, y1, x2, y2);
                mx = max(mx, s);
            }
        }
        return mx > 0;
    };

    int ans = 0;
    int l = 1, r = n*m;
    while (r > l) {
        int mid = (l+r)/2;
        if (check(mid)) r = mid;
        else l = mid + 1;
    }
    return l;
    assert(false);
}

Compilation message (stderr)

quality.cpp: In function 'int rectangle(int, int, int, int, int (*)[3001])':
quality.cpp:39:9: warning: unused variable 'ans' [-Wunused-variable]
   39 |     int ans = 0;
      |         ^~~

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