Compilare: main.cpp: In function 'int main()': main.cpp:33:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(t1);i++) ~^~~~~~~~~~~ main.cpp:36:17: warning: array subscript has type 'char' [-Wchar-subscripts] if(b[val]>0) ^ main.cpp:38:18: warning: array subscript has type 'char' [-Wchar-subscripts] b[val]--; ^ main.cpp:48:14: warning: array subscript has type 'char' [-Wchar-subscripts] a[val]--; ^