Compilare: main.cpp: In member function 'void trie::iadd(const string&, int)': main.cpp:23:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ind == s.size()-1){ ~~~~^~~~~~~~~~~~~ main.cpp: In member function 'void trie::iraze(const string&, int)': main.cpp:31:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ind == s.size()-1){ ~~~~^~~~~~~~~~~~~ main.cpp: In member function 'int trie::ifind(const string&, int)': main.cpp:46:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ind == s.size()-1){ ~~~~^~~~~~~~~~~~~ main.cpp: In member function 'int trie::iprefix(const string&, int)': main.cpp:57:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(son[a] && ind+1<s.size()){ ~~~~~^~~~~~~~~