Created
November 28, 2017 16:25
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import java.util.Scanner; | |
public class OvejasNegras { | |
static boolean ovejablanca=false; | |
static int fil,col; | |
public static void main(String[] args) { | |
Scanner t=new Scanner(System.in); | |
while(t.hasNext()){ | |
ovejablanca=false; | |
String[] campos=t.nextLine().split(" "); | |
col=Integer.parseInt(campos[0]); | |
fil=Integer.parseInt(campos[1]); | |
char[][] ch=new char[fil][col]; | |
for(int i=0;i<fil;i++){ | |
String f=t.nextLine(); | |
for(int j=0;j<col;j++){ | |
ch[i][j]=f.charAt(j); | |
} | |
} | |
for(int i=1;i<fil-1&&ovejablanca==false;i++){ | |
for(int j=1;j<col-1&&ovejablanca==false;j++){ | |
if(ch[i][j]=='.'){ | |
int cc=0; | |
if(ch[i-1][j]=='X')cc++; | |
if(ch[i+1][j]=='X')cc++; | |
if(ch[i][j-1]=='X')cc++; | |
if(ch[i][j+1]=='X')cc++; | |
if(cc==4){ | |
ovejablanca=true; | |
}else if(cc>=2){ | |
ch[i][j]='X'; | |
ovejablanca=buscar(ch,i,j); | |
} | |
} | |
} | |
} | |
if(ovejablanca)System.out.println("SI"); | |
else System.out.println("NO"); | |
}} | |
private static boolean buscar(char[][] ch, int i, int j) { | |
boolean salir=false,salir1=false,salir2=false,salir3=false,salir4=false;; | |
int i2=i; | |
int j2=j; | |
if(i2>0){ | |
if(ch[i2-1][j2]=='.'&&i2-1==0){ | |
salir=true; | |
} | |
} | |
if(j2>0){ | |
if(ch[i2][j2-1]=='.'&&j2-1==0){ | |
salir=true; | |
} | |
} | |
if(i2<fil-1){ | |
if(ch[i2+1][j2]=='.'&&i2+1==fil-1){ | |
salir=true; | |
} | |
} | |
if(j2<col-1){ | |
if(ch[i2][j2+1]=='.'&&j2+1==col-1){ | |
salir1=true; | |
} | |
} | |
if(i2>0){ | |
if(ch[i2-1][j2]=='.'){ | |
ch[i2-1][j2]='X'; | |
if(!buscar(ch,i2-1,j2))salir1=true; | |
} | |
} | |
if(j2>0){ | |
if(ch[i2][j2-1]=='.'){ | |
ch[i2][j2-1]='X'; | |
if(!buscar(ch,i2,j2-1))salir2=true; | |
} | |
} | |
if(i2<fil-1){ | |
if(ch[i2+1][j2]=='.'){ | |
ch[i2+1][j2]='X'; | |
if(!buscar(ch,i2+1,j2))salir3=true; | |
} | |
} | |
if(j2<col-1){ | |
if(ch[i2][j2+1]=='.'){ | |
ch[i2][j2+1]='X'; | |
if(!buscar(ch,i2,j2+1))salir4=true; | |
} | |
} | |
if(!salir&&!salir1&&!salir2&&!salir3&&!salir4)return true; | |
else return false; | |
} | |
} |
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