Submission #481763

#	Time	Username	Problem	Language	Result	Execution time	Memory
481763		SlavicG	Quality Of Living (IOI10_quality)	C++17	100 / 100	2705 ms	106112 KiB

quality

#include"quality.h"
#include "bits/stdc++.h"
using namespace std;
 
#define ll long long
 
#define       forn(i,n)              for(int i=0;i<n;i++)
#define          all(v)              v.begin(), v.end()
#define         rall(v)              v.rbegin(),v.rend()
 
#define            pb                push_back
#define          sz(a)               (int)a.size()
 
const int N = 3001;
int p1[N][N];
int p2[N][N];

int smaller(int x1, int y1, int x2, int y2){
    return p1[x2][y2] - p1[x1 - 1][y2] - p1[x2][y1 - 1] + p1[x1 - 1][y1 - 1];
}
 
int fuck(int x1, int y1, int x2, int y2){
    return p2[x2][y2] - p2[x1 - 1][y2] - p2[x2][y1 - 1] + p2[x1 - 1][y1 - 1];
}

int rectangle(int n, int m, int a, int b, int c[3001][3001]){
    int ans = INT_MAX;
 
    int l = 1,r = n * m;
    while(l <= r)
    {
        int mid = l + r >> 1;

        forn(i, N)forn(j, N)p1[i][j] = p2[i][j] = 0; //didnt qualify to iom because of this line :(
        for(int i = 0;i < n;++i){
            for(int j = 0;j < m;++j){
                if(c[i][j] < mid)p1[i + 1][j + 1] = 1;
                if(c[i][j] > mid)p2[i + 1][j + 1] = 1;
            }
        }
 
        for(int i = 1;i <= n;++i){
            for(int j = 1;j <= m;++j){
                p1[i][j] += p1[i - 1][j] + p1[i][j - 1] - p1[i - 1][j - 1];
                p2[i][j] += p2[i - 1][j] + p2[i][j - 1] - p2[i - 1][j - 1];
            }
        }
 
        bool ok = false;
        for(int i = 0;i + a - 1 < n;++i){
            for(int j = 0;j + b - 1 < m;++j){
                int sm = smaller(i + 1, j + 1, i + a, j + b);
                int gr = fuck(i + 1, j + 1, i + a, j + b);
 
                if(sm == gr){
                    ans = min(ans, mid);
                    ok = true;
                }else if(sm > gr)ok = true;
            }
        }
 
        if(ok){
            r = mid - 1;
        }else l = mid + 1;
    }
    return ans;
}   

Compilation message (stderr)

quality.cpp: In function 'int rectangle(int, int, int, int, int (*)[3001])':
quality.cpp:32:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   32 |         int mid = l + r >> 1;
      |                   ~~^~~

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