View Compilation Error

0_0_22326277_29911.cpp: In function 'int Lis()':
0_0_22326277_29911.cpp:17:35: error: 'INF' was not declared in this scope
     res = lower_bound(dp, dp + n, INF) - dp;
                                   ^
0_0_22326277_29911.cpp: In function 'int main()':
0_0_22326277_29911.cpp:28:26: error: 'INF' was not declared in this scope
         fill(dp, dp + n, INF);
                          ^
0_0_22326277_29911.cpp:29:19: error: 'lis' was not declared in this scope
         ans = lis();
                   ^