View Compilation Error

0_0_14265576_10178.cpp: In function 'void init()':
0_0_14265576_10178.cpp:22:39: error: 'memset' was not declared in this scope
     memset(in_queue,0,sizeof(in_queue));
                                       ^
0_0_14265576_10178.cpp: In function 'int main()':
0_0_14265576_10178.cpp:90:47: error: 'memset' was not declared in this scope
             memset(in_queue,0,sizeof(in_queue));
                                               ^