View Compilation Error

0_0_18117386_10495.cpp: In function 'int main()':
0_0_18117386_10495.cpp:42:92: error: 'inf' was not declared in this scope
         for(int j = 0 ; j < ( 1 << n ) ; ++ j ) for(int k = 0 ; k <= n ; ++ k) dp[j][k] = -inf;
                                                                                            ^