View Compilation Error

0_0_19333287_9496.cpp: In function 'int main()':
0_0_19333287_9496.cpp:40:35: error: 'memset' was not declared in this scope
         memset(pre, -1, sizeof pre);
                                   ^
0_0_19333287_9496.cpp:92:1: error: expected '}' at end of input
 }
 ^