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1. Created using remix-ide: Realtime Et... 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-v0.8.34+commit.80d5c536.js&optimize=undefined&runs=200&gist=

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   {

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     "contracts/3_Ballot.sol": {

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       "__sources__": {

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         "contracts/3_Ballot.sol": {

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           "content": "// SPDX-License-Identifier: GPL-3.0\n\npragma solidity >=0.7.0 <0.9.0;\n\n/** \n * @title Ballot\n * @dev Implements voting process along with vote delegation\n */\ncontract Ballot {\n    // This declares a new complex type which will\n    // be used for variables later.\n    // It will represent a single voter.\n    struct Voter {\n        uint weight; // weight is accumulated by delegation\n        bool voted;  // if true, that person already voted\n        address delegate; // person delegated to\n        uint vote;   // index of the voted proposal\n    }\n\n    // This is a type for a single proposal.\n    struct Proposal {\n        // If you can limit the length to a certain number of bytes, \n        // always use one of bytes1 to bytes32 because they are much cheaper\n        bytes32 name;   // short name (up to 32 bytes)\n        uint voteCount; // number of accumulated votes\n    }\n\n    address public chairperson;\n\n    // This declares a state variable that\n    // stores a 'Voter' struct for each possible address.\n    mapping(address => Voter) public voters;\n\n    // A dynamically-sized array of 'Proposal' structs.\n    Proposal[] public proposals;\n\n    /** \n     * @dev Create a new ballot to choose one of 'proposalNames'.\n     * @param proposalNames names of proposals\n     */\n    constructor(bytes32[] memory proposalNames) {\n        chairperson = msg.sender;\n        voters[chairperson].weight = 1;\n\n        // For each of the provided proposal names,\n        // create a new proposal object and add it\n        // to the end of the array.\n        for (uint i = 0; i < proposalNames.length; i++) {\n            // 'Proposal({...})' creates a temporary\n            // Proposal object and 'proposals.push(...)'\n            // appends it to the end of 'proposals'.\n            proposals.push(Proposal({\n                name: proposalNames[i],\n                voteCount: 0\n            }));\n        }\n    }\n\n     /** \n     * @dev Give 'voter' the right to vote on this ballot. May only be called by 'chairperson'.\n     * @param voter address of voter\n     */\n    function giveRightToVote(address voter) external {\n        // If the first argument of `require` evaluates\n        // to 'false', execution terminates and all\n        // changes to the state and to Ether balances\n        // are reverted.\n        // This used to consume all gas in old EVM versions, but\n        // not anymore.\n        // It is often a good idea to use 'require' to check if\n        // functions are called correctly.\n        // As a second argument, you can also provide an\n        // explanation about what went wrong.\n        require(\n            msg.sender == chairperson,\n            \"Only chairperson can give right to vote.\"\n        );\n        require(\n            !voters[voter].voted,\n            \"The voter already voted.\"\n        );\n        require(voters[voter].weight == 0, \"Voter already has the right to vote.\");\n        voters[voter].weight = 1;\n    }\n\n    /**\n     * @dev Delegate your vote to the voter 'to'.\n     * @param to address to which vote is delegated\n     */\n    function delegate(address to) external {\n        // assigns reference\n        Voter storage sender = voters[msg.sender];\n        require(sender.weight != 0, \"You have no right to vote\");\n        require(!sender.voted, \"You already voted.\");\n\n        require(to != msg.sender, \"Self-delegation is disallowed.\");\n\n        // Forward the delegation as long as\n        // 'to' also delegated.\n        // In general, such loops are very dangerous,\n        // because if they run too long, they might\n        // need more gas than is available in a block.\n        // In this case, the delegation will not be executed,\n        // but in other situations, such loops might\n        // cause a contract to get \"stuck\" completely.\n        while (voters[to].delegate != address(0)) {\n            to = voters[to].delegate;\n\n            // We found a loop in the delegation, not allowed.\n            require(to != msg.sender, \"Found loop in delegation.\");\n        }\n\n        Voter storage delegate_ = voters[to];\n\n        // Voters cannot delegate to accounts that cannot vote.\n        require(delegate_.weight >= 1);\n\n        // Since 'sender' is a reference, this\n        // modifies 'voters[msg.sender]'.\n        sender.voted = true;\n        sender.delegate = to;\n\n        if (delegate_.voted) {\n            // If the delegate already voted,\n            // directly add to the number of votes\n            proposals[delegate_.vote].voteCount += sender.weight;\n        } else {\n            // If the delegate did not vote yet,\n            // add to her weight.\n            delegate_.weight += sender.weight;\n        }\n    }\n\n    /**\n     * @dev Give your vote (including votes delegated to you) to proposal 'proposals[proposal].name'.\n     * @param proposal index of proposal in the proposals array\n     */\n    function vote(uint proposal) external {\n        Voter storage sender = voters[msg.sender];\n        require(sender.weight != 0, \"Has no right to vote\");\n        require(!sender.voted, \"Already voted.\");\n        sender.voted = true;\n        sender.vote = proposal;\n\n        // If 'proposal' is out of the range of the array,\n        // this will throw automatically and revert all\n        // changes.\n        proposals[proposal].voteCount += sender.weight;\n    }\n\n    /** \n     * @dev Computes the winning proposal taking all previous votes into account.\n     * @return winningProposal_ index of winning proposal in the proposals array\n     */\n    function winningProposal() public view\n            returns (uint winningProposal_)\n    {\n        uint winningVoteCount = 0;\n        for (uint p = 0; p < proposals.length; p++) {\n            if (proposals[p].voteCount > winningVoteCount) {\n                winningVoteCount = proposals[p].voteCount;\n                winningProposal_ = p;\n            }\n        }\n    }\n\n    /** \n     * @dev Calls winningProposal() function to get the index of the winner contained in the proposals array and then\n     * @return winnerName_ the name of the winner\n     */\n    function winnerName() external view\n            returns (bytes32 winnerName_)\n    {\n        winnerName_ = proposals[winningProposal()].name;\n    }\n}",

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