View Compilation Error

0_0_29027037_14560.cpp:4:7: error: 'LL' does not name a type
 const LL INF=1e18;
       ^
0_0_29027037_14560.cpp: In function 'LL F(LL, LL, LL)':
0_0_29027037_14560.cpp:8:9: error: 'INF' was not declared in this scope
  LL ans=INF;
         ^
0_0_29027037_14560.cpp: In function 'int main()':
0_0_29027037_14560.cpp:27:10: error: 'INF' was not declared in this scope
   LL sum=INF;
          ^