/in/foo.cc: In function 'int main()':
/in/foo.cc:16:12: error: invalid types 'int[int]' for array subscript
    m[i]=k[i]+k[i+1];
            ^
/in/foo.cc:16:19: error: invalid types 'int[int]' for array subscript
    m[i]=k[i]+k[i+1];
                   ^
/in/foo.cc:20:6: warning: statement has no effect [-Wunused-value]
   abs(ans);
   ~~~^~~~~
/in/foo.cc:23:7: warning: unused variable 'i' [-Wunused-variable]
   int i=1;
       ^
/in/foo.cc:22:2: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
  else
  ^~~~
/in/foo.cc:24:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else'
   m[i]=k[i];
   ^
/in/foo.cc:24:5: error: 'i' was not declared in this scope
   m[i]=k[i];
     ^
/in/foo.cc:27:6: warning: statement has no effect [-Wunused-value]
   abs(ans);
   ~~~^~~~~
/in/foo.cc: In function 'int abs(int)':
/in/foo.cc:35:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^