Compilare: main.cpp: In function 'void build()': main.cpp:19:9: warning: unused variable 'i' [-Wunused-variable] int i, j, l; ^ main.cpp:19:12: warning: unused variable 'j' [-Wunused-variable] int i, j, l; ^ main.cpp:19:15: warning: unused variable 'l' [-Wunused-variable] int i, j, l; ^ main.cpp: In function 'void go(char)': main.cpp:46:48: warning: array subscript has type 'char' [-Wchar-subscripts] st[i][lvl] = first[i][st[i][lvl-1]+1][C]; ^