Compilare: user.cpp: In function ‘int main()’: user.cpp:169:27: warning: unused variable ‘cst’ [-Wunused-variable] int n, l, q, ans = 0, cst = 0; ^ user.cpp: In member function ‘char InParser::read_ch()’: user.cpp:14:38: 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); ^