/in/foo.cc: In function 'int main()':
/in/foo.cc:2:20: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
 #define For(i,j,k) for(int i=j;i<=k;++i)
                    ^
/in/foo.cc:72:3: note: in expansion of macro 'For'
   For(i,1,n+top) head[i]=0;cnt=0;
   ^~~
/in/foo.cc:72:28: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   For(i,1,n+top) head[i]=0;cnt=0;
                            ^~~