Compilare: main.cpp: In function 'void build()': main.cpp:20:16: warning: NULL used in arithmetic [-Wpointer-arith] 20 | if(s[pos]==NULL){ | ^~~~ main.cpp: In function 'long long int cer3(long long int, long long int)': main.cpp:98:1: warning: control reaches end of non-void function [-Wreturn-type] 98 | } | ^