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=

Ballot.sol

contract Ballot {
    
    struct Voter {
        uint weight;
        bool voted;
        uint8 vote;
    }
    
    struct Proposal {
        uint voteCount;
    }
    
    Proposal[] proposals;
    mapping(address => Voter) voter;
    address chairperson;
    
    function Ballot(uint8 _numProposals) public {
        chairperson = msg.sender;
        voters[chairperson].weight = 2;
        proposals.length = _numProposals;
    }
    
    function register(address toVoter) public {
        if (msg.sender != chairperson || voters[toVoter].voted) return;
        voters[toVoter].weight = 1;
        voters[toVoter].voted = false;
    }
    
    function vote(uint8 toProposal) public {
        Voter storage sender = voters[msg.sender];
        if (sender.voted || toProposal >= proposals.length) return;
        sender.voted = true;
        sender.vote = toProposal;
        proposals[toProposal].voteCount += sender.weight;
        
    }
    
    function winningProposal() public constant returns (uint8 _winningProposal) {
        uint256 winningVoteCount = 0;
        for (uint8 prop)
    }
}

ballot.sol

pragma solidity ^0.4.0;
contract Ballot {

    struct Voter {
        uint weight;
        bool voted;
        uint8 vote;
        address delegate;
    }
    struct Proposal {
        uint voteCount;
    }

    address chairperson;
    mapping(address => Voter) voters;
    Proposal[] proposals;

    /// Create a new ballot with $(_numProposals) different proposals.
    function Ballot(uint8 _numProposals) public {
        chairperson = msg.sender;
        voters[chairperson].weight = 1;
        proposals.length = _numProposals;
    }

    /// Give $(toVoter) the right to vote on this ballot.
    /// May only be called by $(chairperson).
    function giveRightToVote(address toVoter) public {
        if (msg.sender != chairperson || voters[toVoter].voted) return;
        voters[toVoter].weight = 1;
    }

    /// Delegate your vote to the voter $(to).
    function delegate(address to) public {
        Voter storage sender = voters[msg.sender]; // assigns reference
        if (sender.voted) return;
        while (voters[to].delegate != address(0) && voters[to].delegate != msg.sender)
            to = voters[to].delegate;
        if (to == msg.sender) return;
        sender.voted = true;
        sender.delegate = to;
        Voter storage delegateTo = voters[to];
        if (delegateTo.voted)
            proposals[delegateTo.vote].voteCount += sender.weight;
        else
            delegateTo.weight += sender.weight;
    }

    /// Give a single vote to proposal $(toProposal).
    function vote(uint8 toProposal) public {
        Voter storage sender = voters[msg.sender];
        if (sender.voted || toProposal >= proposals.length) return;
        sender.voted = true;
        sender.vote = toProposal;
        proposals[toProposal].voteCount += sender.weight;
    }

    function winningProposal() public constant returns (uint8 _winningProposal) {
        uint256 winningVoteCount = 0;
        for (uint8 prop = 0; prop < proposals.length; prop++)
            if (proposals[prop].voteCount > winningVoteCount) {
                winningVoteCount = proposals[prop].voteCount;
                _winningProposal = prop;
            }
    }
}

Bidder.sol

pragma solidity ^0.4.0;

contract Bidder {
    string name = "PKU";
    uint bidAmount = 20000;
    bool eligible = false;
    uint minBid = 1000;
    
    function setName(string name_) public {
        name = name_;
    }
    
    function setBidAmount(uint amount) public {
        bidAmount = amount;
    }
    
    function determineEligibility() public constant returns (bool) {
        if (bidAmount > minBid) return true;
        else return false;
    }
}

cDjwOUThEeigbgqkS_SCag_704ff9e044e111e8894077d0de49d9cb_BallotWithModifier.sol

pragma solidity ^0.4.0;
contract Ballot {

    struct Voter {
        uint weight;
        bool voted;
        uint8 vote;
        address delegate;
    }
    struct Proposal {
        uint voteCount;
    }
    enum Stage {Init,Reg, Vote, Done}
    Stage public stage = Stage.Init;
    
    address chairperson;
    mapping(address => Voter) voters;
    Proposal[] proposals;

    event votingCompleted();
    
    uint startTime;
    //modifiers
   modifier validStage(Stage reqStage)
    { require(stage == reqStage);
      _;
    }


    /// Create a new ballot with $(_numProposals) different proposals.
    function Ballot(uint8 _numProposals) public  {
        chairperson = msg.sender;
        voters[chairperson].weight = 2; // weight is 2 for testing purposes
        proposals.length = _numProposals;
        stage = Stage.Reg;
        startTime = now;
    }

    /// Give $(toVoter) the right to vote on this ballot.
    /// May only be called by $(chairperson).
    function register(address toVoter) public validStage(Stage.Reg) {
        //if (stage != Stage.Reg) {return;}
        if (msg.sender != chairperson || voters[toVoter].voted) return;
        voters[toVoter].weight = 1;
        voters[toVoter].voted = false;
        if (now > (startTime+ 30 seconds)) {stage = Stage.Vote; }        
    }

    /// Give a single vote to proposal $(toProposal).
    function vote(uint8 toProposal) public validStage(Stage.Vote)  {
       // if (stage != Stage.Vote) {return;}
        Voter storage sender = voters[msg.sender];
        if (sender.voted || toProposal >= proposals.length) return;
        sender.voted = true;
        sender.vote = toProposal;   
        proposals[toProposal].voteCount += sender.weight;
        if (now > (startTime+ 30 seconds)) {stage = Stage.Done; votingCompleted();}        
        
    }

    function winningProposal() public validStage(Stage.Done) constant returns (uint8 _winningProposal) {
       //if(stage != Stage.Done) {return;}
        uint256 winningVoteCount = 0;
        for (uint8 prop = 0; prop < proposals.length; prop++)
            if (proposals[prop].voteCount > winningVoteCount) {
                winningVoteCount = proposals[prop].voteCount;
                _winningProposal = prop;
            }
       assert (winningVoteCount > 0);

    }
}

coin.sol

pragma solidity ^0.4.0;

contract Coin {
    address public minter;
    mapping (address => uint) public balances;
    
    event Sent(address from, address to, uint amount);
    
    function Coin() public {
        minter = msg.sender;
    }
    
    function mint (address receiver, uint amount) public {
        if (msg.sender != minter) return;
        balances[receiver] += amount;
    }
    
    function send(address receiver, uint amount) public {
        if (balances[msg.sender] < amount) return;
        balances[msg.sender] -= amount;
        balances[receiver] += amount;
        Sent(msg.sender, receiver, amount);
    }
    
}

M0d_n0TQEeigbgqkS_SCag_33725f6044d011e8a24183dd10a23236_BallotBasic.sol

pragma solidity ^0.4.0;
contract Ballot {

    struct Voter {
        uint weight;
        bool voted;
        uint8 vote;
       // address delegate;
    }
    struct Proposal {
        uint voteCount; // could add other data about proposal
    }

    address chairperson;
    mapping(address => Voter) voters;
    Proposal[] proposals;
    

    /// Create a new ballot with $(_numProposals) different proposals.
    function Ballot(uint8 _numProposals) public {
        chairperson = msg.sender;
        voters[chairperson].weight = 2;
        proposals.length = _numProposals; 
    }

    /// Give $(toVoter) the right to vote on this ballot.
    /// May only be called by $(chairperson).
    function register(address toVoter) public {
        if (msg.sender != chairperson || voters[toVoter].voted) return;
        voters[toVoter].weight = 1;
        voters[toVoter].voted = false;
    }

    /// Give a single vote to proposal $(toProposal).
    function vote(uint8 toProposal) public {
        Voter storage sender = voters[msg.sender];
        if (sender.voted || toProposal >= proposals.length) return;
        sender.voted = true;
        sender.vote = toProposal;
        proposals[toProposal].voteCount += sender.weight;
    }

    function winningProposal() public constant returns (uint8 _winningProposal) {
        uint256 winningVoteCount = 0;
        for (uint8 prop = 0; prop < proposals.length; prop++)
            if (proposals[prop].voteCount > winningVoteCount) {
                winningVoteCount = proposals[prop].voteCount;
                _winningProposal = prop;
            }
    }
}
 

M0el60TQEei2HRICdYDggg_3381538044d011e8b5898344f74f78b1_Minter.sol

pragma solidity ^0.4.0;

contract Coin {
    // The keyword "public" makes those variables
    // readable from outside.
    address public minter;
    mapping (address => uint) public balances;

    // Events allow light clients to react on
    // changes efficiently.
    event Sent(address from, address to, uint amount);

    // This is the constructor whose code is
    // run only when the contract is created.
    function Coin() public{
        minter = msg.sender;
    }

    function mint(address receiver, uint amount) public  {
        if (msg.sender != minter) return;
        balances[receiver] += amount;
    }

    function send(address receiver, uint amount) public {
        if (balances[msg.sender] < amount) return;
        balances[msg.sender] -= amount;
        balances[receiver] += amount;
        Sent(msg.sender, receiver, amount);
    }
}

M0f01ETQEeigbgqkS_SCag_3384fd0044d011e8af0327b052455519_SimpleStorage.sol

pragma solidity ^0.4.0; 
// Imagine a big integer that the whole world could share
contract SimpleStorage {
    uint storedData;

    function set(uint x) public {
        storedData = x;
    }

    function get() constant public returns (uint)  {
        return storedData;
    }
    
    function increment (uint n) public {
        storedData = storedData + n;
        return;
    }
    
    function decrement (uint n) public {
        storedData = storedData - n;
        return;
    }
    
}

 

M0fNwkTQEeigbgqkS_SCag_3381c8b044d011e893d9db16d507b83b_BallotWithStages.sol

pragma solidity ^0.4.0;
contract Ballot {

    struct Voter {
        uint weight;
        bool voted;
        uint8 vote;
    }
    struct Proposal {
        uint voteCount;
    }
    enum Stage {Init,Reg, Vote, Done}
    Stage public stage = Stage.Init;
    
    address chairperson;
    mapping(address => Voter) voters;
    Proposal[] proposals;

    
    uint startTime;   

    /// Create a new ballot with $(_numProposals) different proposals.
    function Ballot(uint8 _numProposals) public  {
        chairperson = msg.sender;
        voters[chairperson].weight = 2; // weight is 2 for testing purposes
        proposals.length = _numProposals;
        stage = Stage.Reg;
        startTime = now;
    }

    /// Give $(toVoter) the right to vote on this ballot.
    /// May only be called by $(chairperson).
    function register(address toVoter) public {
        if (stage != Stage.Reg) {return;}
        if (msg.sender != chairperson || voters[toVoter].voted) return;
        voters[toVoter].weight = 1;
        voters[toVoter].voted = false;
        if (now > (startTime+ 10 seconds)) {stage = Stage.Vote; startTime = now;}        
    }

    /// Give a single vote to proposal $(toProposal).
    function vote(uint8 toProposal) public  {
        if (stage != Stage.Vote) {return;}
        Voter storage sender = voters[msg.sender];
        if (sender.voted || toProposal >= proposals.length) return;
        sender.voted = true;
        sender.vote = toProposal;   
        proposals[toProposal].voteCount += sender.weight;
        if (now > (startTime+ 10 seconds)) {stage = Stage.Done;}        
        
    }

    function winningProposal() public constant returns (uint8 _winningProposal) {
       if(stage != Stage.Done) {return;}
        uint256 winningVoteCount = 0;
        for (uint8 prop = 0; prop < proposals.length; prop++)
            if (proposals[prop].voteCount > winningVoteCount) {
                winningVoteCount = proposals[prop].voteCount;
                _winningProposal = prop;
            }
       
    }
}

M0hCPETQEeiVcg6irwbSYA_3380421044d011e8afa3f903c9071b9c_Greeter.sol

pragma solidity ^0.4.0;

contract Greeter  {
    string public yourName;  // data
    
    /* This runs when the contract is executed */
   function Greeter() public {
        yourName = "World";
    } 
    
    function set(string name)public {
        yourName = name;
    }
    
    function hello() constant public returns (string) {
        return yourName;
    }
}

M0i3XUTQEei2HRICdYDggg_3372867044d011e8b870a3398eee9397_BidderData.sol

pragma solidity ^0.4.0; 

contract Bidder {
    
     string public name;
     uint public bidAmount = 20000;
     bool public  eligible;
     uint constant minBid = 1000;
     
     
}

simplestorage.sol

contract SimpleStorage {
    uint storedData;
    
    function set(uint x) public {
        storedData = x;
    }
    
    function get() constant public returns (uint) {
        return storedData;
    }
    
    function increment(uint n) public {
        storedData += n;
        return;
    }
    
    function decrement(uint n) public {
        storedData -= n;
        return;
    }
}

test.sol

contract Test {
    
    int public number;
    
    function Test(int num) public {
        number = num;
    }
}