array gas estimation

array_gas.sol

pragma solidity ^0.4.24;

contract Test {
   
    uint256[] x = [1,2,3];
    uint256[] y = [1];
    uint256[] x1 = [1,2,3];
    uint256[] y1 = [1];
   
    function testx() public {
        delete x;
    }
   
    function testy() public {
        delete y;
    }
   
    function testx1() public {
        x1.length = 0;
    }
   
    function testy1() public {
        y1.length = 0;
    }
   
}