View Compilation Error

0_0_32326288_31129.cpp:3:1: error: '_int64' does not name a type
 _int64 dp[2001][4];
 ^
0_0_32326288_31129.cpp: In function 'int main()':
0_0_32326288_31129.cpp:7:2: error: 'dp' was not declared in this scope
  dp[1][1]=dp[1][0] = 26;
  ^