Compilare: main.cpp: In constructor 'Trie::Trie()': main.cpp:41:6: warning: 'Trie::dir' will be initialized after [-Wreorder] int dir; ^~~ main.cpp:39:6: warning: 'long long int Trie::sub' [-Wreorder] int sub; ^~~ main.cpp:43:2: warning: when initialized here [-Wreorder] Trie() : dir(0), sub(0), best(-INF) ^~~~ main.cpp: At global scope: main.cpp:147:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] main() ^ main.cpp: In function 'long long int encode(char)': main.cpp:23:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In function 'char decode(long long int)': main.cpp:33:1: warning: control reaches end of non-void function [-Wreturn-type] } ^