Compilare: user.cpp: In function ‘int main()’: user.cpp:119:7: warning: unused variable ‘k’ [-Wunused-variable] LL k=Q[i].k; ^ user.cpp:104:7: warning: unused variable ‘eq’ [-Wunused-variable] bool eq=1; ^ user.cpp:97:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("hamster.out", "wt", stdout); ^ user.cpp: In member function ‘char InParser::read_ch()’: user.cpp:32:38: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 4096, fin); ^