Created using remix-ide: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://remix.ethereum.org/#version=soljson-v0.4.24+commit.e67f0147.js&optimize=false&gist=

Counter.sol

pragma solidity ^0.4.23;

contract Counter {
    uint private count = 0;

    function increment() public {
        count += 1;
    }

    function decrement() public {
        count -= 1;
    }

    function getCount() public view returns (uint) {
        return count;
    }
}

DataManipulation.sol

pragma solidity ^0.4.8;

contract DataManipulation{
    uint public x = 1;
    uint public y = 2;
    
    // (x, y) = (y, x);
    
    function swap(){
        assert(x == 1 && y == 2);
        (y, x) = (x, y);
        assert(x == 2 && y == 1);
    }
    
    function generateRandomNum(string input) returns (uint){
        bytes32 hash = keccak256(input);
        return (uint(hash) + now) % 100;
    }
    
}

erc20.sol

pragma solidity ^0.4.23;

contract EIP20Interface {
    /* This is a slight change to the ERC20 base standard.
    function totalSupply() constant returns (uint256 supply);
    is replaced with:
    uint256 public totalSupply;
    This automatically creates a getter function for the totalSupply.
    This is moved to the base contract since public getter functions are not
    currently recognised as an implementation of the matching abstract
    function by the compiler.
    */
    /// total amount of tokens
    uint256 public totalSupply;

    /// @param _owner The address from which the balance will be retrieved
    /// @return The balance
    function balanceOf(address _owner) public view returns (uint256 balance);

    /// @notice send `_value` token to `_to` from `msg.sender`
    /// @param _to The address of the recipient
    /// @param _value The amount of token to be transferred
    /// @return Whether the transfer was successful or not
    function transfer(address _to, uint256 _value) public returns (bool success);

    /// @notice send `_value` token to `_to` from `_from` on the condition it is approved by `_from`
    /// @param _from The address of the sender
    /// @param _to The address of the recipient
    /// @param _value The amount of token to be transferred
    /// @return Whether the transfer was successful or not
    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success);

    /// @notice `msg.sender` approves `_spender` to spend `_value` tokens
    /// @param _spender The address of the account able to transfer the tokens
    /// @param _value The amount of tokens to be approved for transfer
    /// @return Whether the approval was successful or not
    function approve(address _spender, uint256 _value) public returns (bool success);

    /// @param _owner The address of the account owning tokens
    /// @param _spender The address of the account able to transfer the tokens
    /// @return Amount of remaining tokens allowed to spent
    function allowance(address _owner, address _spender) public view returns (uint256 remaining);

    // solhint-disable-next-line no-simple-event-func-name
    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}

contract EIP20 is EIP20Interface {
    
    using SafeMath for uint256;
    uint256 constant private MAX_UINT256 = 2**256 - 1;
    mapping (address => uint256) public balances;
    mapping (address => mapping (address => uint256)) public allowed;
    /*
    NOTE:
    The following variables are OPTIONAL vanities. One does not have to include them.
    They allow one to customise the token contract & in no way influences the core functionality.
    Some wallets/interfaces might not even bother to look at this information.
    */
    string public name;                   //fancy name: eg Simon Bucks
    uint8 public decimals;                //How many decimals to show.
    string public symbol;                 //An identifier: eg SBX

    constructor(
        uint256 _initialAmount,
        string _tokenName,
        uint8 _decimalUnits,
        string _tokenSymbol
    ) public {
        balances[msg.sender] = _initialAmount;               // Give the creator all initial tokens
        totalSupply = _initialAmount;                        // Update total supply
        name = _tokenName;                                   // Set the name for display purposes
        decimals = _decimalUnits;                            // Amount of decimals for display purposes
        symbol = _tokenSymbol;                               // Set the symbol for display purposes
    }

    function transfer(address _to, uint256 _value) public returns (bool success) {
        require(balances[msg.sender] >= _value);
        balances[msg.sender] =  balances[msg.sender].sub(_value);
        balances[_to] = balances[_to].add(_value);
        emit Transfer(msg.sender, _to, _value); //solhint-disable-line indent, no-unused-vars
        return true;
    }

    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
        uint256 allowance = allowed[_from][msg.sender];
        require(balances[_from] >= _value && allowance >= _value);
        balances[_to] = balances[_to].add(_value);
        balances[_from] =  balances[_from].sub(_value);
        if (allowance < MAX_UINT256) {
            allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
        }
        emit Transfer(_from, _to, _value); //solhint-disable-line indent, no-unused-vars
        return true;
    }

    function balanceOf(address _owner) public view returns (uint256 balance) {
        return balances[_owner];
    }

    function approve(address _spender, uint256 _value) public returns (bool success) {
        allowed[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value); //solhint-disable-line indent, no-unused-vars
        return true;
    }

    function allowance(address _owner, address _spender) public view returns (uint256 remaining) {
        return allowed[_owner][_spender];
    }
}

library SafeMath {

  /**
  * @dev Multiplies two numbers, throws on overflow.
  */
  function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {
    if (a == 0) {
      return 0;
    }
    c = a * b;
    assert(c / a == b);
    return c;
  }

  /**
  * @dev Integer division of two numbers, truncating the quotient.
  */
  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    // assert(b > 0); // Solidity automatically throws when dividing by 0
    // uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    return a / b;
  }

  /**
  * @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
  */
  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  /**
  * @dev Adds two numbers, throws on overflow.
  */
  function add(uint256 a, uint256 b) internal pure returns (uint256 c) {
    c = a + b;
    assert(c >= a);
    return c;
  }
}

Owned.sol

pragma solidity ^0.4.23;

contract Owned {
    address public owner;
    event TransferOwner(address);
    constructor (address x) public {
        owner = x;
    }

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

    function transferOwnership(address newOwner) onlyOwner public {
        owner = newOwner;
        emit TransferOwner(owner);
    }
}

Random.sol

pragma solidity ^0.4.13;

contract Random {

    function getNow() public constant returns (uint) {
        return now; // or block.timestamps
    }
    
    function getBlockNum() public constant returns (uint) {
        return block.number;
    }
    
    function generateRandom(uint min, uint max) public constant returns (uint) {
        return (getNow() % (max - min)) + min; 
    }

}

SafeCounter.sol

pragma solidity ^0.4.0;

contract Token {
  function balanceOf(address who) public view returns (uint256);
  function transfer(address to, uint256 value) public returns (bool);
  function totalSupply() public view returns (uint256);
  function name() public returns (string);
  function symbol() public returns (string);
}
contract Owned {
    address public owner;
    event TransferOwner(address);
    constructor () public {
        owner = msg.sender;
    }

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

    function transferOwnership(address newOwner) onlyOwner public {
        owner = newOwner;
        emit TransferOwner(owner);
    }
}
contract TokenAirdrop is Owned {
  address public tokenAddress = 0xe5163379fA1B7aeDfAA799927A4FB340e4AA4bF3; // qrc20 address
  Token private token;
  

  constructor() public {
    token = Token(tokenAddress);
  }

  function balanceOf(address _owner) public view returns (uint256 balance) {
    return token.balanceOf(_owner);
  }
  
  function totalSupply() public view returns(uint256){
      return token.totalSupply();
  }
  function name() public view returns (string){
      return token.name();
  }
  function symbol() public view returns (string){
      return token.symbol();
  }
  function transfer(address to, uint256 value) public returns (bool){
      return token.transfer(to,value);
  }
  function setTokenaddress(address _newToken) public onlyOwner returns (bool){
      token = Token(_newToken);
  }

  function drop(address[] dests, uint256 amount) public {
    assert(token.balanceOf(msg.sender) >= amount * dests.length);

    uint256 i = 0;
    while (i < dests.length) {
      token.transfer(dests[i], amount);
      i++;
    }
  }
}

safeMath.sol

library SafeMath {

  /**
  * @dev Multiplies two numbers, throws on overflow.
  */
  function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {
    if (a == 0) {
      return 0;
    }
    c = a * b;
    assert(c / a == b);
    return c;
  }

  /**
  * @dev Integer division of two numbers, truncating the quotient.
  */
  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    // assert(b > 0); // Solidity automatically throws when dividing by 0
    // uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    return a / b;
  }

  /**
  * @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
  */
  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  /**
  * @dev Adds two numbers, throws on overflow.
  */
  function add(uint256 a, uint256 b) internal pure returns (uint256 c) {
    c = a + b;
    assert(c >= a);
    return c;
  }
}

Storage.sol

pragma solidity ^0.4.23;

contract Storage {
    uint8 data;

    function set(uint8 x) public {
        data = x;
    }

    function get() public view returns (uint8) {
        return data;
    }
}

Token.sol

pragma solidity ^0.4.23;

contract Token {
    mapping (address => uint256) public balances;

    constructor(uint256 initialSupply) public {
        balances[msg.sender] = initialSupply;
    }

    function transfer(address _to, uint256 _value) public {
        require(balances[msg.sender] >= _value);
        require(balances[_to] + _value >= balances[_to]);   // Avoid overflows
        balances[msg.sender] -= _value;
        balances[_to] += _value;
    }
}

tokenTransfer.sol

pragma solidity ^0.4.0;

contract Token {
  function balanceOf(address who) public view returns (uint256);
  function transfer(address to, uint256 value) public returns (bool);
  function totalSupply() public view returns (uint256);
  function name() public returns (string);
  function symbol() public returns (string);
}
contract Owned {
    address public owner;
    event TransferOwner(address);
    constructor () public {
        owner = msg.sender;
    }

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

    function transferOwnership(address newOwner) onlyOwner public {
        owner = newOwner;
        emit TransferOwner(owner);
    }
}
contract TokenAirdrop is Owned {
  address public tokenAddress = 0xe5163379fA1B7aeDfAA799927A4FB340e4AA4bF3; // qrc20 address
  Token private token;
  

  constructor() public {
    token = Token(tokenAddress);
  }

  function balanceOf(address _owner) public view returns (uint256 balance) {
    return token.balanceOf(_owner);
  }
  
  function totalSupply() public view returns(uint256){
      return token.totalSupply();
  }
  function name() public view returns (string){
      return token.name();
  }
  function symbol() public view returns (string){
      return token.symbol();
  }
  function transfer(address to, uint256 value) public returns (bool){
      return token.transfer(to,value);
  }
  function setTokenaddress(address _newToken) public onlyOwner returns (bool){
      tokenAddress = _newToken;
      token = Token(_newToken);
  }

  function drop(address[] dests, uint256 amount) public {
    assert(token.balanceOf(msg.sender) >= amount * dests.length);

    uint256 i = 0;
    while (i < dests.length) {
      token.transfer(dests[i], amount);
      i++;
    }
  }
}

types.sol

pragma solidity ^0.4.23;

contract Animal {

    string public _birthDay; // 生日
    uint public _age; // 年龄
    uint internal _weight; // 身高
    string private _name; // 姓名
    

    constructor() public {
      _age = 29;
      _weight = 170;
      _name = "Lucky dog";
      _birthDay = "2011-01-01";
    }

    function birthDay() view public returns (string) {
      return _birthDay;
    }

    function age() view public returns (uint) {
      return _age;
    }

    function height() view public returns (uint) {
      return _weight;
    }

    function name() view private returns (string) {
      return _name;
    }

}

contract Gaojin is Animal {
    
    function setHeight(uint x) public {
        _weight = x;
    }
    
}

x.sol

pragma solidity ^0.4.23;

contract Win0123rps {
    event PLAY(uint, uint);

    function play(uint x) payable returns(string) {
        require(msg.value > 1 ether);
        uint random = generateRandom(1, 4);
        emit PLAY(x, random);
        if (random == x) {
            return "xiangdeng";
        } else if (random > x) {
            if ((random - x) == 1) {
                return "lose";
            } else {
                return "win";
            }
        } else {
            if ((x - random) == 1) {
                return "win";
            } else {
                return "lose";
            }
        }
    }

    function getNow() public constant returns(uint) {
        return now; // or block.timestamps
    }

    function getBlockNum() public constant returns(uint) {
        return block.number;
    }

    function generateRandom(uint min, uint max) public constant returns(uint) {
        return (getNow() % (max - min)) + min;
    }
}