Compilare: main.cpp: In constructor 'Trie::Trie()': main.cpp:13:38: warning: passing NULL to non-pointer argument 2 of 'void* memset(void*, int, size_t)' [-Wconversion-null] memset(fiu, NULL, sizeof(fiu)); ^ main.cpp: In function 'int main()': main.cpp:54:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < strlen(a) ; ++j) ~~^~~~~~~~~~~ main.cpp:55:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int t = j; t < strlen(a) ; ++t){ ~~^~~~~~~~~~~ main.cpp:64:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < strlen(a) ; ++j) ~~^~~~~~~~~~~ main.cpp:65:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int t = j; t < strlen(a) ; ++t){ ~~^~~~~~~~~~~ main.cpp:48:34: 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:49:36: 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:51:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:53:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s", a); ^ main.cpp:61:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &m); ^ main.cpp:63:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s", a); ^