Compilare: user.cpp: In function ‘void add(int)’: user.cpp:14:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(counter!=cuv.size()) ~~~~~~~^~~~~~~~~~~~ user.cpp:17:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<legaturi[pos].size();i++) ~^~~~~~~~~~~~~~~~~~~~~ user.cpp:20:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i==legaturi[pos].size()) ~^~~~~~~~~~~~~~~~~~~~~~ user.cpp:41:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=counter;i<cuv.size();i++) ~^~~~~~~~~~~ user.cpp:44:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i+1<cuv.size()) ~~~^~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:57:33: 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); ^ user.cpp:58:35: 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); ^ user.cpp:62:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %s",&c,aux); ^