Compilare: main.cpp: In function 'int main()': main.cpp:64:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | for(int j=0;j<a.size();j++) | ~^~~~~~~~~ main.cpp:66:47: warning: array subscript has type 'char' [-Wchar-subscripts] 66 | if(a[j]>='a' && a[j]<='z' && f[a[j]]==0) | ^ main.cpp:68:18: warning: array subscript has type 'char' [-Wchar-subscripts] 68 | f[a[j]]++; | ^ main.cpp:70:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 70 | for(int j=0;j<b.size();j++) | ~^~~~~~~~~ main.cpp:72:47: warning: array subscript has type 'char' [-Wchar-subscripts] 72 | if(b[j]>='a' && b[j]<='z' && f[b[j]]==0) | ^ main.cpp:74:18: warning: array subscript has type 'char' [-Wchar-subscripts] 74 | f[b[j]]++; | ^ main.cpp:79:18: warning: array subscript has type 'char' [-Wchar-subscripts] 79 | if(f[ch]>0) | ^~ main.cpp:80:21: warning: array subscript has type 'char' [-Wchar-subscripts] 80 | val[ch]=++counter; | ^~ main.cpp:85:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 85 | for(int i=0;i<a.size();i++) | ~^~~~~~~~~ main.cpp:88:47: warning: array subscript has type 'char' [-Wchar-subscripts] 88 | c1+=(char)(j/(1<<(val[a[i]]-1))+'0'); | ^ main.cpp:92:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 92 | for(int i=0;i<b.size();i++) | ~^~~~~~~~~ main.cpp:95:47: warning: array subscript has type 'char' [-Wchar-subscripts] 95 | c2+=(char)(j/(1<<(val[b[i]]-1))+'0'); | ^