Submission #745534

#	Time	Username	Problem	Language	Result	Execution time	Memory
745534		MohamedAliSaidane	Rectangles (IOI19_rect)	C++14	10 / 100	23 ms	11720 KiB

rect

#include <bits/stdc++.h>
#include "rect.h"
using namespace std;
typedef long long ll;

typedef vector<int> vi;

#define pb push_back
#define ff first
#define ss second

const int nax = 2505;

int n, m;
vector<vi> A;
ll ans = 0ll;
int LG[nax];
int spr[nax][nax][12];
int spc[nax][nax][12];

void init()
{
    LG[1] = 0;
    for(int i = 2; i < nax; i++)
        LG[i] = LG[i/2] + 1;
    for(int row = 0; row < n; row++)
    {
        for(int col = 0; col < m; col++)
            spr[row][col][0] = spc[col][row][0] =  A[row][col];
    }
    for(int j = 1; j < 12; j++)
    {
        for(int row = 0; row < n; row++)
        {
            for(int col = 0; col < m; col++)
            {
                spr[row][col][j] = max(spr[row][col][j - 1], spr[row][col + (1 << (j - 1))][j - 1]);
                spc[col][row][j] = max(spc[col][row][j - 1], spc[col][row + (1 << (j - 1))][j - 1]);
            }
        }
    }
}
int maxir(int row, int l, int r)
{
    int j = LG[r - l + 1];
    return max(spr[row][l][j], spr[row][r - (1 << j) + 1][j]);
}
int maxic(int col, int l, int r)
{
    int j = LG[r - l + 1];
    return max(spc[col][l][j], spc[col][r - (1 << j) + 1][j]);
}
ll count_rectangles(vector<vi> a)
{
    n = a.size();
    m = a[0].size();
    A= a;
    if(n <= 2 || m <= 2)
        return 0ll;
    init();
    int pref[m + 1];
    memset(pref, 0, sizeof(pref));
    for(int i = 0; i < m; i ++)
    {
        pref[i + 1] = pref[i] + (min(A[0][i], A[2][i]) <= A[1][i]);
    }
    for(int i = 1; i < m - 1; i++)
    {
        for(int j = i; j < m - 1; j++)
        {
            if(pref[j + 1] - pref[i] == 0)
            {
                if(min(A[1][i - 1], A[1][j + 1]) > maxir(1, i, j))
                    ans++;
            }
        }
    }
    return ans;
}

• Subtask 1: 0 / 8
• Subtask 2: 0 / 7
• Subtask 3: 0 / 12
• Subtask 4: 0 / 22
• Subtask 5: 10 / 10
• Subtask 6: 0 / 13
• Subtask 7: 0 / 28