Submission #367381

#	Time	Username	Problem	Language	Result	Execution time	Memory
367381		ijxjdjd	Quality Of Living (IOI10_quality)	C++14	80 / 100	5102 ms	182640 KiB

quality

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

#define FR(i, N) for (int i = 0; i < int(N); i++)
#define all(x) begin(x), end(x)
int pref[3001][3001];
int rectangle(int R, int C, int H, int W, int Q[3001][3001]) {
    int low = 0;
    int high = R*C-1;
    vector<pair<int, int>> coords;
    FR(i, R){
        FR(j, C){
            coords.push_back({i, j});
        }
    }
    auto comp = [&] (const auto& lhs, const auto& rhs) {
        return Q[lhs.first][lhs.second] < Q[rhs.first][rhs.second];
    };
    auto sum = [&] (int i, int j) {
        return pref[i][j] - (i >= H ? pref[i-H][j] : 0) - (j >= W ? pref[i][j-W] : 0) + (j >= W && i >= H ? pref[i-H][j-W] : 0);
    };
    sort(all(coords), comp);
    int base = H*W/2;
    while (low < high) {
        int mid = (low + high)/2;
        FR(i, R) FR(j, C) pref[i][j] = 0;
        FR(i, mid+1) {
            pref[coords[i].first][coords[i].second]++;
        }
        FR(i, R) {
            FR(j, C) {
                pref[i][j] += (i > 0 ? pref[i-1][j] : 0) + (j > 0 ? pref[i][j-1] : 0) - (i > 0 && j > 0 ? pref[i-1][j-1] : 0);
            }
        }
        for (int i = H-1; i < R; i++) {
            for (int j = W-1; j < C; j++) {
                if (sum(i, j) > base) {
                    high = mid;
                }
            }
        }
        if (high != mid) {
            low = mid+1;
        }
    }
    return high+1;
}

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 20 / 20
• Subtask 5: 0 / 20