View Compilation Error

0_0_35970875_9468.cpp: In function 'int main()':
0_0_35970875_9468.cpp:92:44: error: 'inf' was not declared in this scope
         for(i = 0; i < 40000; ++i) DP[i] = inf;
                                            ^
0_0_35970875_9468.cpp:93:23: error: 'inf' was not declared in this scope
         minus_score = inf;
                       ^