Compilare: main.cpp: In function 'int main()': main.cpp:19:19: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 19 | for(i=0; i<strlen(s); ++i) | ~^~~~~~~~~~ main.cpp:20:19: warning: array subscript has type 'char' [-Wchar-subscripts] 20 | f1[s[i]]++; | ~~~^ main.cpp:21:19: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 21 | for(i=0; i<strlen(t); ++i) | ~^~~~~~~~~~ main.cpp:22:19: warning: array subscript has type 'char' [-Wchar-subscripts] 22 | f2[t[i]]++; | ~~~^ main.cpp:23:19: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 23 | for(i=0; i<strlen(s); ++i) | ~^~~~~~~~~~ main.cpp:24:21: warning: array subscript has type 'char' [-Wchar-subscripts] 24 | if(c[s[i]]==0) | ~~~^ main.cpp:26:26: warning: array subscript has type 'char' [-Wchar-subscripts] 26 | if(f1[s[i]]!=f2[s[i]])cnt++; | ~~~^ main.cpp:26:36: warning: array subscript has type 'char' [-Wchar-subscripts] 26 | if(f1[s[i]]!=f2[s[i]])cnt++; | ~~~^ main.cpp:27:22: warning: array subscript has type 'char' [-Wchar-subscripts] 27 | c[s[i]]=1; | ~~~^