Compilare: main.cpp: In function 'void addTrie(trie*, char*, int)': main.cpp:18:14: warning: NULL used in arithmetic [-Wpointer-arith] if(*s == NULL) ^~~~ main.cpp: In function 'void findTrie(trie*, char*)': main.cpp:30:14: warning: NULL used in arithmetic [-Wpointer-arith] if(*s == NULL) ^~~~ main.cpp: In function 'int main()': main.cpp:45:34: 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); ^ main.cpp:46:36: 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); ^ main.cpp:49:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &na); ^ main.cpp:52:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n", s); ^ main.cpp:58:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &nb); ^ main.cpp:61:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s", s); ^