View Compilation Error

0_0_17299673_17125.cpp: In function 'void spfa(int)':
0_0_17299673_17125.cpp:32:43: error: 'memset' was not declared in this scope
     memset(visited, false, sizeof(visited));
                                           ^
0_0_17299673_17125.cpp: In function 'int main()':
0_0_17299673_17125.cpp:75:38: error: 'memset' was not declared in this scope
         memset(head, -1, sizeof(head));        
                                      ^