View Compilation Error

0_0_36630266_17727.cpp: In function 'int solve(int)':
0_0_36630266_17727.cpp:11:27: error: 'memset' was not declared in this scope
  memset(vis, 0, sizeof vis);
                           ^
0_0_36630266_17727.cpp: In function 'int main()':
0_0_36630266_17727.cpp:27:26: error: 'memset' was not declared in this scope
  memset(sg, -1, sizeof sg); 
                          ^