Compilare: main.cpp: In function 'bool gasit(std::__cxx11::string, std::__cxx11::string)': main.cpp:20:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a.size();i++) ~^~~~~~~~~ main.cpp:21:19: warning: array subscript has type 'char' [-Wchar-subscripts] freq[a[i]]++; ^ main.cpp:22:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<b.size();i++) ~^~~~~~~~~ main.cpp:24:21: warning: array subscript has type 'char' [-Wchar-subscripts] if(freq[b[i]]==0) ^ main.cpp:27:22: warning: array subscript has type 'char' [-Wchar-subscripts] freq[b[i]]--; ^ main.cpp:28:21: warning: array subscript has type 'char' [-Wchar-subscripts] if(freq[b[i]]<0) ^ main.cpp: In function 'int main()': main.cpp:65:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v.size();j++) ~^~~~~~~~~ main.cpp:79:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<sol2.size();i++) ~^~~~~~~~~~~~