Compilare: main.cpp: In function 'bool comp(std::__cxx11::string, std::__cxx11::string)': main.cpp:27:19: warning: array subscript has type 'char' [-Wchar-subscripts] if (p[a[i]] == p[b[i]]) ^ main.cpp:27:30: warning: array subscript has type 'char' [-Wchar-subscripts] if (p[a[i]] == p[b[i]]) ^ main.cpp:29:23: warning: array subscript has type 'char' [-Wchar-subscripts] return (p[a[i]] < p[b[i]]); ^ main.cpp:29:33: warning: array subscript has type 'char' [-Wchar-subscripts] return (p[a[i]] < p[b[i]]); ^ main.cpp: In function 'int main()': main.cpp:52:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i<a.size(); i++) ~^~~~~~~~~ main.cpp:60:19: warning: array subscript has type 'char' [-Wchar-subscripts] p[c[i]] = i; ^ main.cpp:62:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i<a.size(); i++) ~^~~~~~~~~ main.cpp:39:9: warning: unused variable 'j' [-Wunused-variable] int j, imin, l, k; //2 ^ main.cpp:39:12: warning: unused variable 'imin' [-Wunused-variable] int j, imin, l, k; //2 ^~~~ main.cpp:39:18: warning: unused variable 'l' [-Wunused-variable] int j, imin, l, k; //2 ^ main.cpp:39:21: warning: unused variable 'k' [-Wunused-variable] int j, imin, l, k; //2 ^