Compilare: user.cpp: In function ‘int main()’: user.cpp:27:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i(0); i < s.size(); i++) ^ user.cpp:28:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] coresp[s[i]] = i; ^ user.cpp:37:37: warning: array subscript has type ‘char’ [-Wchar-subscripts] poate[i][j][coresp[c]][coresp[c]] = 1; ^ user.cpp:37:48: warning: array subscript has type ‘char’ [-Wchar-subscripts] poate[i][j][coresp[c]][coresp[c]] = 1; ^ user.cpp:52:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i(0); i < s.size(); i++) ^ user.cpp:55:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k(0); k < s.size(); k++) { ^ user.cpp:56:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int l(k); l < s.size(); l++) { ^