View Compilation Error

0_0_38989591_11364.cpp:5:7: error: '_int64' does not name a type
    5 | const _int64 maxn = 2e9;
      |       ^~~~~~
0_0_38989591_11364.cpp: In function 'int main()':
0_0_38989591_11364.cpp:10:17: error: '_int64' was not declared in this scope
   10 |                 _int64 dp[2010][1005] = { 0 }, a[2010] = { 0 };
      |                 ^~~~~~
0_0_38989591_11364.cpp:10:46: error: expected primary-expression before ',' token
   10 |                 _int64 dp[2010][1005] = { 0 }, a[2010] = { 0 };
      |                                              ^
0_0_38989591_11364.cpp:10:48: error: 'a' was not declared in this scope
   10 |                 _int64 dp[2010][1005] = { 0 }, a[2010] = { 0 };
      |                                                ^
0_0_38989591_11364.cpp:11:25: error: 'dp' was not declared in this scope
   11 |                 cout << dp[0][0] << endl;
      |                         ^~
0_0_38989591_11364.cpp:17:46: error: 'maxn' was not declared in this scope; did you mean 'main'?
   17 |                                 dp[i][j] = { maxn };
      |                                              ^~~~
      |                                              main