View Compilation Error

0_0_32852435_26331.cpp: In function 'void get_map()':
0_0_32852435_26331.cpp:8:26: error: 'memset' was not declared in this scope
  memset(map,0,sizeof(map));
                          ^
0_0_32852435_26331.cpp: In function 'void go()':
0_0_32852435_26331.cpp:34:28: error: 'memset' was not declared in this scope
  memset(mark,0,sizeof(mark));
                            ^