View Compilation Error

0_0_19866501_14532.cpp: In function 'int main()':
0_0_19866501_14532.cpp:5:42: error: 'memset' was not declared in this scope
 #define fill(x, t) memset(x, t, sizeof(x))
                                          ^
0_0_19866501_14532.cpp:29:3: note: in expansion of macro 'fill'
   fill(map, 0);
   ^