/in/foo.cc: In function 'int main()':
/in/foo.cc:15:9: warning: array subscript has type 'char' [-Wchar-subscripts]
   l[s[i]]++;
         ^
/in/foo.cc:31:2: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
  else
  ^~~~
/in/foo.cc:33:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else'
     return 0;
     ^~~~~~