View Compilation Error

0_0_30342554_11957.cpp:5:7: error: 'inf' does not name a type
 const inf=-1e9;
       ^
0_0_30342554_11957.cpp: In function 'int main()':
0_0_30342554_11957.cpp:14:14: error: 'inf' was not declared in this scope
   memset(ans,inf,sizeof(ans));
              ^