Compilare: user.cpp: In constructor ‘trie::trie()’: user.cpp:21:38: warning: passing NULL to non-pointer argument 2 of ‘void* memset(void*, int, size_t)’ [-Wconversion-null] memset(next,NULL,sizeof(next)); ^ user.cpp: In function ‘int main()’: user.cpp:117:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < strlen(buff); i++) ^ user.cpp:118:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = i; j < strlen(buff); j++) ^ user.cpp: In function ‘bool searchTrie(char*, trie*)’: user.cpp:68:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘bool searchTrie2(char*, trie*)’: user.cpp:79:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:101:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sub.in","r",stdin); ^ user.cpp:102:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sub.out","w",stdout); ^ user.cpp:112:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&Na); ^ user.cpp:115:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",buff); ^