A. IQ Test

time limit per test

memory limit per test

input

output

In the city of Ultima Thule job applicants are often offered an IQ test.

4 × 4 square painted on it. Some of the square's cells are painted black and others are painted white. Your task is to repaint at most one cell the other color so that the picture has a 2 × 2

2 × 2

Input

j-th character of the i-th line equals "." if the cell in the i-th row and the j-th column of the square is painted white, and "#", if the cell is black.

Output

YES" (without the quotes), if the test can be passed and "NO" (without the quotes) otherwise.

Sample test(s)

input

#### .#.. #### ....

output

YES

input

#### .... #### ....

output

NO

Note

2 × 2 square is on the intersection of the 1-st and 2-nd row with the 1-st and 2-nd column.

枚举看是否有一个矩形有3个字符相等

一开始居然把4个判断打错了？《上午也是……

#include<cstdio>
#include<cstring>
#include<cstdlib>
#include<cctype>
using namespace std;
#define MAXLen (4+10)
char a[MAXLen][MAXLen];
bool flag=0;
int main()
{
  for (int i=1;i<=4;i++) scanf("%s",a[i]+1);
  for (int i=1;i<4;i++)
    for (int j=1;j<4;j++)
    {
      if (a[i][j]==a[i][j+1]&&a[i][j]==a[i+1][j]) flag=1;
      if (a[i][j]==a[i][j+1]&&a[i][j]==a[i+1][j+1]) flag=1;
      if (a[i][j]==a[i+1][j]&&a[i][j]==a[i+1][j+1]) flag=1;
      if (a[i+1][j]==a[i][j+1]&&a[i+1][j]==a[i+1][j+1]) flag=1;
       
    }
  if (flag) printf("YES\n");
  else printf("NO\n");
  return 0;
}