View Compilation Error

0_0_27348876_26801.cpp: In function 'void init(myint)':
0_0_27348876_26801.cpp:17:28: error: 'memset' was not declared in this scope
  memset(num, 0, sizeof(num));
                            ^
0_0_27348876_26801.cpp: In function 'int main()':
0_0_27348876_26801.cpp:9:16: error: expected ')' before 'PRId64'
 #define MYPRID PRId64
                ^
0_0_27348876_26801.cpp:45:11: note: in expansion of macro 'MYPRID'
  scanf("%"MYPRID, &n);
           ^
0_0_27348876_26801.cpp:9:16: error: expected ')' before 'PRId64'
 #define MYPRID PRId64
                ^
0_0_27348876_26801.cpp:48:11: note: in expansion of macro 'MYPRID'
  scanf("%"MYPRID, &ai);
           ^
0_0_27348876_26801.cpp:9:16: error: expected ')' before 'PRId64'
 #define MYPRID PRId64
                ^
0_0_27348876_26801.cpp:50:11: note: in expansion of macro 'MYPRID'
  scanf("%"MYPRID, &bi);
           ^
0_0_27348876_26801.cpp:55:18: error: 'strlen' was not declared in this scope
  len = strlen(str);
                  ^