View Compilation Error

0_0_38684261_2372.cpp:37:13: error: 'int64_t' does not name a type
   37 | using i64 = int64_t;
      |             ^~~~~~~
0_0_38684261_2372.cpp:16:1: note: 'int64_t' is defined in header '<cstdint>'; did you forget to '#include <cstdint>'?
   15 | #include<cstdio>
  +++ |+#include <cstdint>
   16 | #define endl '\n'