Compilare: main.cpp: In function 'bool gasit(std::__cxx11::string, std::__cxx11::string)': main.cpp:18:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a.size();i++) ~^~~~~~~~~ main.cpp:19:19: warning: array subscript has type 'char' [-Wchar-subscripts] freq[a[i]]++; ^ main.cpp:20:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<b.size();i++) ~^~~~~~~~~ main.cpp:22:21: warning: array subscript has type 'char' [-Wchar-subscripts] if(freq[b[i]]==0) ^ main.cpp:25:22: warning: array subscript has type 'char' [-Wchar-subscripts] freq[b[i]]--; ^ main.cpp: In function 'int main()': main.cpp:57:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v.size();i++) ~^~~~~~~~~ main.cpp:61:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v.size();j++) ~^~~~~~~~~ main.cpp:73:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<sol2.size();i++) ~^~~~~~~~~~~~