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pragma solidity ^0.4.24;
contract SimpleStore {
  function _bytes32ArrayToUintArray(bytes32[] _bytes32Array) private pure returns(uint[]) {
    uint lenIn = _bytes32Array.length;
    uint lenOut = lenIn * 32;
    uint[] memory ret = new uint[](lenOut);
    uint cnt = 0;
    for(uint i = 0; i < lenIn; i++){
      for(uint j = 0; j < 32; j++){
        ret[cnt++] = uint(_bytes32Array[i][j]);
      }
    }
    return ret;
  }
  function _getRandomUintArray(uint len) private view returns(uint[]) {
    uint nowLocal = now;
    address msgSender = msg.sender;
    uint times = 1 + uint(len / 32);
    bytes32[] memory bytes32Array = new bytes32[](times);
    uint i;
    for(i = 0; i < times; i++){
      uint seed = i + 1234567890;
      bytes32Array[i] = keccak256(seed, nowLocal, msgSender);
    }
    uint[] memory buf = _bytes32ArrayToUintArray(bytes32Array);
    uint[] memory ret = new uint[](len);
    for(i = 0; i < len; i++){
      ret[i] = buf[i];
    }    
    return ret;
  }
  function test(uint len) public view returns(uint[]) { 
    return _getRandomUintArray(len);
  }
}