0_0_21565513_11456.cpp:6:1: error: expected unqualified-id before '?' token ? ^ 0_0_21565513_11456.cpp:9:7: error: 'LL' does not name a type const LL INF = 4e18; ^ 0_0_21565513_11456.cpp:10:1: error: expected unqualified-id before '?' token ? ^