Compilare: main.cpp: In function 'void trieOp::addWord(std::__cxx11::string&, int, trie*&)': main.cpp:35:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ind<word.size()) ~~~^~~~~~~~~~~~ main.cpp:38:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (ind == word.size()) node->last++; ~~~~^~~~~~~~~~~~~~ main.cpp: In function 'void trieOp::deleteWord(std::__cxx11::string&, int, trie*&)': main.cpp:42:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (node->neigh[word[ind] - 'a'] != NULL && ind<word.size()) ~~~^~~~~~~~~~~~ main.cpp:45:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (ind == word.size()) node->last--; ~~~~^~~~~~~~~~~~~~ main.cpp: In function 'int trieOp::showApp(std::__cxx11::string&, int, trie*&)': main.cpp:55:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (ind == word.size()) ~~~~^~~~~~~~~~~~~~ main.cpp: In function 'int trieOp::showPrefix(std::__cxx11::string&, int, trie*&)': main.cpp:64:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (ind == word.size()) ~~~~^~~~~~~~~~~~~~ main.cpp: In function 'int trieOp::showApp(std::__cxx11::string&, int, trie*&)': main.cpp:60:2: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In function 'int trieOp::showPrefix(std::__cxx11::string&, int, trie*&)': main.cpp:74:2: warning: control reaches end of non-void function [-Wreturn-type] } ^