Compilare: main.cpp: In function 'int main()': main.cpp:16:22: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 16 | for(int i=0;i<strlen(s);i++) | ~^~~~~~~~~~ main.cpp:17:20: warning: array subscript has type 'char' [-Wchar-subscripts] 17 | frs[s[i]]++; | ~~~^ main.cpp:18:22: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 18 | for(int i=0;i<strlen(t);i++) | ~^~~~~~~~~~ main.cpp:20:20: warning: array subscript has type 'char' [-Wchar-subscripts] 20 | frt[t[i]]++; | ~~~^