Compilare: main.cpp: In function 'void addTrie(trie*, char*)': main.cpp:16:14: warning: NULL used in arithmetic [-Wpointer-arith] if(*s == NULL) ^~~~ main.cpp: In function 'int findTrie(trie*, char*)': main.cpp:24:14: warning: NULL used in arithmetic [-Wpointer-arith] if(*s == NULL) ^~~~ main.cpp: In function 'void dfs(trie*, int)': main.cpp:47:14: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] cuv[k] = NULL; ^~~~ main.cpp: In function 'trie* buildTrie()': main.cpp:35:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n", s); ^ main.cpp: In function 'int main()': main.cpp:59:34: 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:60:36: 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:63:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &na); ^ main.cpp:64:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n", s); ^ main.cpp:71:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &nb); ^ main.cpp:74:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s", s); ^