A. IQ Test

time limit per test

2 seconds

memory limit per test

256 megabytes

input

standard input

output

standard output

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

The test is as follows: the person gets a piece of squared paper with a 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 square,
completely consisting of cells of the same color. If the initial picture already has such a square, the person should just say so and the test will be completed.

Your task is to write a program that determines whether it is possible to pass the test. You cannot pass the test if either repainting any cell or no action doesn't result in a 2 × 2 square,
consisting of cells of the same color.

Input

Four lines contain four characters each: the 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

Print "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

In the first test sample it is enough to repaint the first cell in the second row. After such repainting the required 2 × 2 square is on the intersection
of the 1-st and 2-nd row with the 1-st
and 2-nd column.

解題說明：此題的意思很明確，最多改變4*4地區內的一個值找出一個2*2地區，該地區內的值完全相同。雖然輸入為字串，但比較起來還是麻煩，可以轉換為數字矩陣來做，“#”的位置標記為1，“.” 的位置標記為0，這樣判斷時只需要對一個2*2的矩形值求和，判斷值是否等於2，如果等於2，證明有兩黑兩白，無法通過僅改變一塊實現題目要求，其它數字滿足題意。

#include <iostream>#include <cstdio>#include <cstdlib>#include <cmath>#include <cstring>#include <string>#include <algorithm>using namespace std;int main(){int a[4][4],i,j,k,s,flag;char c;flag=0;for(i=0;i<4;i++){for(j=0;j<4;j++){cin>>c;if(c=='#'){a[i][j]=1;}else{a[i][j]=0;}}}for(i=0;i<3;i++){for(j=0;j<3;j++){s=0;for(k=i;k<=i+1;k++){s=s+a[k][j]+a[k][j+1];}if(s!=2){cout<<"YES"<<endl;flag=1;goto ABC;}}}ABC:if(flag==0){cout<<"NO"<<endl;}return 0;}