Compilare: user.cpp: In member function ‘int Trie::find(int)’: user.cpp:17:29: warning: variable ‘last’ set but not used [-Wunused-but-set-variable] for(int y=B[x % P], last=0; y; y = T[y].nxt) ^ user.cpp: In function ‘int main()’: user.cpp:59:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("hashuri.in", "r", stdin); ^ user.cpp:60:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("hashuri.out", "w", stdout); ^ user.cpp: In member function ‘Scanner& Scanner::operator>>(var&)’: user.cpp:48:9: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] for(sign = 0; !isdigit(buff[poz]) && buff[poz] != '-'; adv()); ^ user.cpp:49:45: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(buff[poz] == '-') sign = 1, adv(); ^ user.cpp:50:9: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] for(a = 0; isdigit(buff[poz]); a = a * 10 + buff[poz] - '0', adv()); ^