View Compilation Error

0_0_36317489_10322.cpp: In function 'void init()':
0_0_36317489_10322.cpp:12:38: error: 'memset' was not declared in this scope
 #define mem(a,b) memset(a,b,sizeof(a))
                                      ^
0_0_36317489_10322.cpp:67:3: note: in expansion of macro 'mem'
   mem(dp, 0);
   ^
0_0_36317489_10322.cpp: In function 'void solve()':
0_0_36317489_10322.cpp:12:38: error: 'memset' was not declared in this scope
 #define mem(a,b) memset(a,b,sizeof(a))
                                      ^
0_0_36317489_10322.cpp:89:2: note: in expansion of macro 'mem'
  mem(dp2, -1);
  ^