View Compilation Error

0_0_22066256_19854.cpp: In function 'void spfa(int)':
0_0_22066256_19854.cpp:25:28: error: 'memset' was not declared in this scope
  memset(vis, 0, sizeof(vis));
                            ^
0_0_22066256_19854.cpp: In function 'int main()':
0_0_22066256_19854.cpp:54:32: error: 'memset' was not declared in this scope
   memset(Next, -1, sizeof(Next));
                                ^