Compilare: user.cpp: In function ‘int main()’: user.cpp:43:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] icp[a][b]=icp[b][a]=1; ^ user.cpp:43:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] icp[a][b]=icp[b][a]=1; ^ user.cpp:43:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] icp[a][b]=icp[b][a]=1; ^ user.cpp:43:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] icp[a][b]=icp[b][a]=1; ^