View Compilation Error

0_0_17294969_31627.cpp: In function 'bool judge(Mat, Mat)':
0_0_17294969_31627.cpp:31:29: error: invalid conversion from 'int' to 'const char*' [-fpermissive]
     return strcmp(a.mat[0][0],b.mat[0][0]);
                             ^
In file included from 0_0_17294969_31627.cpp:2:0:
GCC4.9.2/x86_64-w64-mingw32/include/string.h:53:15: note: initializing argument 1 of 'int strcmp(const char*, const char*)'
   int __cdecl strcmp(const char *_Str1,const char *_Str2);
               ^
0_0_17294969_31627.cpp:31:41: error: invalid conversion from 'int' to 'const char*' [-fpermissive]
     return strcmp(a.mat[0][0],b.mat[0][0]);
                                         ^
In file included from 0_0_17294969_31627.cpp:2:0:
GCC4.9.2/x86_64-w64-mingw32/include/string.h:53:15: note: initializing argument 2 of 'int strcmp(const char*, const char*)'
   int __cdecl strcmp(const char *_Str1,const char *_Str2);
               ^