Eroare de compilare: user.cpp: In member function ‘int str::query(long long int, int)’: user.cpp:26:10: error: ‘cons’ was not declared in this scope for(cons auto &e : useful[bucket]) ^ user.cpp:26:15: error: expected ‘;’ before ‘auto’ for(cons auto &e : useful[bucket]) ^ user.cpp:29:5: error: expected primary-expression before ‘return’ return res; ^ user.cpp:29:5: error: expected ‘;’ before ‘return’ user.cpp:29:5: error: expected primary-expression before ‘return’ user.cpp:29:5: error: expected ‘)’ before ‘return’ user.cpp:24:10: warning: unused variable ‘bucket’ [-Wunused-variable] int bucket = abs(val) % MOD; ^ user.cpp: In function ‘void read_and_build()’: user.cpp:41:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("revsecv.in", "r", stdin); ^ user.cpp:42:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", s); ^ user.cpp: In function ‘int main()’: user.cpp:77:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("revsecv.out", "w", stdout); ^ user.cpp: In member function ‘int str::query(long long int, int)’: user.cpp:30:2: warning: control reaches end of non-void function [-Wreturn-type] } ^