View Compilation Error

0_0_29588124_28109.cpp:10:2: error: stray '#' in program
     return *(int*)a-*(int*)b;
  ^
0_0_29588124_28109.cpp:10:9: error: stray '#' in program
     return *(int*)a-*(int*)b;
         ^
0_0_29588124_28109.cpp: In function 'int cmp(const void*, const void*)':
0_0_29588124_28109.cpp:10:3: error: lvalue required as unary '&' operand
     return *(int*)a-*(int*)b;
   ^
0_0_29588124_28109.cpp:10:10: error: lvalue required as unary '&' operand
     return *(int*)a-*(int*)b;
          ^
0_0_29588124_28109.cpp: In function 'int main()':
0_0_29588124_28109.cpp:25:21: error: 'memset' was not declared in this scope
 memset(f,0,sizeof(f));
                     ^