Compilare: main.cpp: In function 'void Add(Trie*, int)': main.cpp:26:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k == s.size()) ~~^~~~~~~~~~~ main.cpp: In function 'bool Delete(Trie*&, int)': main.cpp:43:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k == s.size()) ~~^~~~~~~~~~~ main.cpp:60:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int Query(Trie*, int)': main.cpp:66:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k == s.size()) ~~^~~~~~~~~~~ main.cpp: In function 'int Prefix(Trie*, int)': main.cpp:81:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k == s.size() || nod->fii[(s[k]-'a')] == 0) ~~^~~~~~~~~~~ main.cpp:81:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation] if(k == s.size() || nod->fii[(s[k]-'a')] == 0) ^~ main.cpp:83:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' if(nod->fii[(s[k]-'a')] &&(nod->fii[s[k]-'a']->nr || nod->fii[s[k]-'a']->sons )) ^~ main.cpp: In function 'int Query(Trie*, int)': main.cpp:77:1: warning: control reaches end of non-void function [-Wreturn-type] } ^