View Compilation Error

0_0_38637919_19612.cpp: In function 'void build(int, int, int)':
0_0_38637919_19612.cpp:26:2: error: 'memset' was not declared in this scope
  memset(t[p].sum, 0, sizeof t[p].sum);
  ^~~~~~
0_0_38637919_19612.cpp:26:2: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
0_0_38637919_19612.cpp:3:1:
+#include <cstring>
 
0_0_38637919_19612.cpp:26:2:
  memset(t[p].sum, 0, sizeof t[p].sum);
  ^~~~~~