Compilare: user.cpp: In function ‘int main()’: user.cpp:15:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] M[x][y]=M[y][x]=1; ^ user.cpp:15:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] M[x][y]=M[y][x]=1; ^ user.cpp:15:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] M[x][y]=M[y][x]=1; ^ user.cpp:15:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] M[x][y]=M[y][x]=1; ^ user.cpp:18:11: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(M[a][n[i]]) ^ user.cpp:18:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(M[a][n[i]]) ^ user.cpp:20:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(!M[b][n[i]]) S[i]=1,b=n[i]; ^ user.cpp:20:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(!M[b][n[i]]) S[i]=1,b=n[i]; ^