Submission #891476

#	Time	Username	Problem	Language	Result	Execution time	Memory
891476		Muhammad_Aneeq	Rectangles (IOI19_rect)	C++17	25 / 100	5062 ms	136400 KiB

rect

#include <vector>
#include <iostream>
using namespace std;
int const N=2600;
bool z1=0;
struct segt
{
	vector<int>a;
	int seg[4*N];
	segt(vector<int>&s)
	{
		a=s;
		build(1,0,a.size()-1);
	}	
	void build(int i,int st,int en)
	{
		if (st==en)
		{
			seg[i]=a[st];
			return;
		}
		int mid=(st+en)/2;
		build(i*2,st,mid);build(i*2+1,mid+1,en);
		seg[i]=max(seg[i*2],seg[i*2+1]);
	}
	int get(int i,int l,int r,int st,int en)
	{
		if (st>=l&&en<=r)
			return seg[i];
		if (st>r||en<l)
			return 0;
		int mid=(st+en)/2;
		return max(get(i*2,l,r,st,mid),get(i*2+1,l,r,mid+1,en));
	}
};
segt* St[2][N]={NULL};
long long count_rectangles(vector<vector<int>>a)
{
	int n=a.size(),m=a[0].size();
	for (int i=0;i<n;i++)
		St[0][i]=new segt(a[i]);
	for (int i=0;i<m;i++)
	{
		vector<int>z;
		for (int j=0;j<n;j++)
			z.push_back(a[j][i]);
		z1=(i==3);
		St[1][i]=new segt(z);
	}
	long long ans=0;
	for (int i=1;i<n-1;i++)
	{
		for (int j=1;j<m-1;j++)
		{
			for (int k=i;k<n-1;k++)
			{
				for (int l=j;l<m-1;l++)
				{
					bool w=0;
					bool z=0;
					if (i==4&&j==3&&k==4&&l==3)
					{
						z=1;
					}
					for (int o=i;o<=k&&!w;o++)
					{
						int f=St[0][o]->get(1,j,l,0,m-1);
						if (f>=a[o][j-1]||f>=a[o][l+1])
							w=1;
					}
					for (int o=j;o<=l&&!w;o++)
					{
						int f=St[1][o]->get(1,i,k,0,n-1); 
						if (f>=a[i-1][o]||f>=a[k+1][o])
							w=1;
					}
					ans+=(!w);
				}
			}
		}
	}
	return ans;
}

Compilation message (stderr)

rect.cpp: In function 'long long int count_rectangles(std::vector<std::vector<int> >)':
rect.cpp:60:11: warning: variable 'z' set but not used [-Wunused-but-set-variable]
   60 |      bool z=0;
      |           ^

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