Pwnable.sol

pragma solidity ^0.4.18;

contract Pwnable {
  address public owner;
  address[] a1;


  function Pwnable() public {
    owner = msg.sender;
    a1.length -= 1;
  }

  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }

  function fun(uint offset, address addr) public returns (uint) {
      a1[offset] = addr;
  }

  function transferOwnership(address newOwner) public onlyOwner {
    require(newOwner != address(0));
    owner = newOwner;
  }

}