Compilare: user.cpp: In function ‘bool Ok(int)’: user.cpp:16:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(v[b[i]].size() - poz < lg) ^ user.cpp:16:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v[b[i]].size() - poz < lg) ~~~~~~~~~~~~~~~~~~~~~^~~~ user.cpp:20:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] int st = 0, dr = v[b[i + 1]].size() - 1, mid; ^ user.cpp:23:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(v[b[i + 1]][mid] > v[b[i]][poz + lg - 1]) ^ user.cpp:23:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(v[b[i + 1]][mid] > v[b[i]][poz + lg - 1]) ^ user.cpp: In function ‘int main()’: user.cpp:49:11: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[a[i]].push_back(i); ^