View Compilation Error

0_0_15616889_21504.cpp: In function 'int bfs()':
0_0_15616889_21504.cpp:26:32: error: 'memset' was not declared in this scope
     memset( vis,0,sizeof( vis ));
                                ^
0_0_15616889_21504.cpp:27:22: error: 'strcpy' was not declared in this scope
     strcpy( now.nn,a );//now.nn=a;
                      ^