View Compilation Error

0_0_21565515_26226.cpp:6:1: error: expected unqualified-id before '?' token
 ?
 ^
0_0_21565515_26226.cpp:9:7: error: 'LL' does not name a type
 const LL INF = 4e18;
       ^
0_0_21565515_26226.cpp:10:1: error: expected unqualified-id before '?' token
 ?
 ^