View Compilation Error

0_0_38114569_4118.cpp: In function 'int SG(int)':
0_0_38114569_4118.cpp:13:30: error: 'memset' was not declared in this scope
  memset(vis,false,sizeof(vis));
                              ^
0_0_38114569_4118.cpp: In function 'void solve()':
0_0_38114569_4118.cpp:31:25: error: 'memset' was not declared in this scope
  memset(sg,-1,sizeof(sg));
                         ^