Compilare: user.cpp: In function ‘bool vali(int)’: user.cpp:17:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(v[b[i]].size()-p<l) ^ user.cpp:17:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v[b[i]].size()-p<l) ~~~~~~~~~~~~~~~~^~ user.cpp:21:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] int st=0,dr=v[b[i+1]].size()-1,mij; ^ user.cpp:25:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(v[b[i+1]][mij]>v[b[i]][l+p-1]) ^ user.cpp:25:37: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(v[b[i+1]][mij]>v[b[i]][l+p-1]) ^ user.cpp: In function ‘int main()’: user.cpp:56:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[a[i]].push_back(i); ^