Compilare: user.cpp: In function ‘void addWord(int, char*, node**)’: user.cpp:31:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pos == strlen(word)) ^ user.cpp:41:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pos == strlen(word)-1) ^ user.cpp: In function ‘void deleteWord(int, char*, node**)’: user.cpp:54:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pos == strlen(word) - 1) ^ user.cpp: In function ‘int getWordCount(int, char*, node**)’: user.cpp:65:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pos == strlen(word) - 1) ^ user.cpp: In function ‘void getMaxLenPrefix(int, char*, node**)’: user.cpp:86:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pos == strlen(word) || (*x) == NULL) ^ user.cpp: In function ‘int getWordCount(int, char*, node**)’: user.cpp:69:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:98:33: 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:99:35: 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:108:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",w); ^