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pragma solidity ^0.4.18;
contract SimpleStore {
  uint[] private a = new uint[](10);
  function getA() public view returns(uint[]) {
    return a;
  }

function setLen(uint _len) public {
    require(_len < 32);
    a.length = _len;
  }

function _getRandomHash() private view returns (bytes32) {
    return keccak256(now);
  }

function _bytes32ToUintArray(bytes32 b) private pure returns(uint[32] memory ret){
    for(uint i=0; i<32; i++){
      ret[i] = uint(b[i]);
    }
  }

function init() public {
    uint[32] memory b = _bytes32ToUintArray(_getRandomHash());
    for(uint i=0; i<a.length; i++){
      a[i] = b[i];
    }
  }

function _calcCloneArray(uint[] _a) private pure returns(uint[]) {
    uint aLen = _a.length;
    uint[] memory b = new uint[](aLen);
    for(uint i=0; i<aLen; i++){
      b[i] = _a[i];
    }
    return b;
  }

function doQuicksort() public {
    uint[] memory b = _calcCloneArray(a);
    _quicksort(b);
    a = b;
  }

function _quicksort(uint[] _a) private pure {
    uint left = 0;
    uint right = _a.length - 1;
    _quicksort_core(_a, left, right);
  }

function _swap(uint[] _a, uint _l, uint _r) private pure {
    uint t = _a[_l];
    _a[_l] = _a[_r];
    _a[_r] = t;
  }
}