View Compilation Error

0_0_14202591_15846.cpp: In function 'int check(int, int)':
0_0_14202591_15846.cpp:39:24: error: lvalue required as left operand of assignment
     while(j>=0&&a[i][j]=a[x][y])
                        ^
0_0_14202591_15846.cpp: In function 'int ok(int, int)':
0_0_14202591_15846.cpp:56:21: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
         if(a[i][j]!=".")
                     ^
0_0_14202591_15846.cpp: In function 'int main()':
0_0_14202591_15846.cpp:83:28: error: no 'operator++(int)' declared for postfix '++' [-fpermissive]
                         cnt++=a[i][j];
                            ^