Submission #283567

#	Time	Username	Problem	Language	Result	Execution time	Memory
283567		tinjyu	Quality Of Living (IOI10_quality)	C++14	100 / 100	3687 ms	246216 KiB

quality

#include "quality.h"
#include <iostream>
using namespace std;
long long int h,w,r,c,sum[3005][3005],a[3005][3005];
bool check(){
	for(int i=0;i<r;i++)
	{
		for(int j=0;j<c;j++)
		{
			sum[i][j]=a[i][j];
			if(i>0)sum[i][j]+=sum[i-1][j];
			if(j>0)sum[i][j]+=sum[i][j-1];
			if(i>0 && j>0)sum[i][j]-=sum[i-1][j-1];
			//cout<<sum[i][j]<<" ";
		}
		//cout<<endl;
	}
	for(int i=h-1;i<r;i++)
	{
		for(int j=w-1;j<c;j++)
		{
			int now=sum[i][j];
			if(i-h>=0)now-=sum[i-h][j];

			if(j-w>=0)now-=sum[i][j-w];

			if(i-h>=0 && j-w>=0)now+=sum[i-h][j-w];
			//cout<<i<<" "<<j<<" "<<now<<endl;

			if(now<=0)return 1;
		}
	}
	return 0;
}
int rectangle(int R, int C, int H, int W, int Q[3001][3001]) {
	long long int ans,le=1,ri=R*C;
	h=H;
	w=W;
	r=R;
	c=C;
	while(le<=ri)
	{
		int mid=(le+ri)/2;
		//cout<<mid<<endl;
		for(int i=0;i<R;i++)
		{
			for(int j=0;j<C;j++)
			{
				if(Q[i][j]<mid)a[i][j]=-1;
				if(Q[i][j]==mid)a[i][j]=0;
				if(Q[i][j]>mid)a[i][j]=1;
				//cout<<a[i][j]<<" ";
			}
			//cout<<endl;
		}
		if(check()==1)
		{
			ans=mid;
			ri=mid-1;
		}
		else le=mid+1;
	}
	return ans;
}

Compilation message (stderr)

quality.cpp: In function 'int rectangle(int, int, int, int, int (*)[3001])':
quality.cpp:63:9: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
   63 |  return ans;
      |         ^~~

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