/in/foo.cc: In function 'int main()':
/in/foo.cc:24:36: warning: array subscript has type 'char' [-Wchar-subscripts]
for(int i=0;i<len;++i) ++num[s[i]];
^
/in/foo.cc:25:38: warning: array subscript has type 'char' [-Wchar-subscripts]
for(char i='A';i<='Z';++i) if(num[i]) q.push(num[i]),tot++;
^
/in/foo.cc:25:53: warning: array subscript has type 'char' [-Wchar-subscripts]
for(char i='A';i<='Z';++i) if(num[i]) q.push(num[i]),tot++;
^
/in/foo.cc:27:13: warning: unused variable 'f3' [-Wunused-variable]
int f1,f2,f3;
^~