Compilare: user.cpp: In function ‘void Read()’: user.cpp:20:12: warning: unused variable ‘len’ [-Wunused-variable] int i, len, j; ^ user.cpp:20:17: warning: unused variable ‘j’ [-Wunused-variable] int i, len, j; ^ user.cpp:24:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld ", &val); ^ user.cpp: In function ‘void Solve()’: user.cpp:34:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &q); ^ user.cpp:37:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &query); ^