Compilare: user.cpp: In function ‘int main()’: user.cpp:18:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[i][v[i]]=i; ^ user.cpp:26:39: warning: array subscript has type ‘char’ [-Wchar-subscripts] int t=a[q][u[j][k]]; ^ user.cpp:30:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(nr==strlen(u[j])&&q>=0) ^