请教一下这道C++题，NOIP

Question

Answer 1

int main(){
  char a[5][5]={'T','R','G','S','J',
                'X','D','O','K','I',
                'M',' ','V','L','N',
                'W','P','A','B','E',
                'U','Q','H','C','F'};
  char c;
  int row=2;
  int col=1;
  while((c=getchar())&&c!='0'){
      switch(c){
      case 'A':{
          if(row==0){
            printf("This pazzle has no final configuration");
            return 0;
          }
          else{
            a[row][col]=a[row-1][col];
            a[row-1][col]=' ';
            row=row-1;
            break;
          }
      }
      case 'B':{
          if(row==4){
            printf("This pazzle has no final configuration");
            return 0;
          }
          else{
            a[row][col]=a[row+1][col];
            a[row+1][col]=' ';
            row=row+1;
            break;
          }
      }
      case 'L':{
          if(col==0){
            printf("This pazzle has no final configuration");
            return 0;
          }
          else{
            a[row][col]=a[row][col-1];
            a[row][col-1]=' ';
            col=col-1;
            break;
          }

      }
      case 'R':{
          if(row==4){
            printf("This pazzle has no final configuration");
            return 0;
          }
          else{
            a[row][col]=a[row][col+1];
            a[row][col+1]=' ';
            col=col+1;
            break;
          }

      }


      }

  }
  for(int i=0;i<5;i++){
    for(int j=0;j<5;j++){
        printf("%c ",a[i][j]);
    }
    printf("\n");
  }

}