Compilare: main.cpp: In function 'void modif(trie*&, int, int)': main.cpp:21:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz == s.size()) { ~~~~^~~~~~~~~~~ main.cpp: In function 'int apar(trie*&, int)': main.cpp:33:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz == s.size()) ~~~~^~~~~~~~~~~ main.cpp: In function 'int lcp(trie*&, int)': main.cpp:40:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz == s.size()) return poz; ~~~~^~~~~~~~~~~ main.cpp:44:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:49:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("trie.in", "r", stdin); ^ main.cpp:50:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("trie.out", "w", stdout); ^