View Compilation Error

0_0_19194326_4419.cpp: In member function 'int network::mincost(int, int)':
0_0_19194326_4419.cpp:29:38: error: 'memset' was not declared in this scope
             memset(pv, -1, sizeof(pv));
                                      ^
0_0_19194326_4419.cpp: In member function 'void network::init(int)':
0_0_19194326_4419.cpp:64:31: error: 'memset' was not declared in this scope
         memset(head, -1, 4 * v);
                               ^