佛薩奇（公排互助）系統程式設計開發技術

佛薩奇公排互助是一種基於區塊鏈的互助合約，旨在幫助有需要的人們獲得資金支援。該合約可以自動執行，並按照一定

的規則將參與者之間的資金分配。在本文中，我們將介紹如何使用Solidity編寫一個簡單的佛薩奇公排互助合約，並演

示它在以太坊區塊鏈上執行的基本步驟。

下面是一個簡單的Solidity程式碼示例：

pragma solidity ^0.8.0;

contract Fosachi {

    address public owner;

    uint256 public maxContributionAmount;

    uint256 public pairAmount;

    uint256 public initialFee;

    

    mapping(address => uint256) public balances;

    address[] public participants;

    uint256 public currentRound = 0;

    constructor(uint256 _maxContributionAmount, uint256 _pairAmount, uint256 _initialFee) {

        owner = msg.sender;

        maxContributionAmount = _maxContributionAmount;

        pairAmount = _pairAmount;

        initialFee = _initialFee;

    }

    function deposit() public payable {

        require(msg.value > 0, "You must send a value greater than 0");

        require(msg.value <= maxContributionAmount, "You cannot send more than maxContributionAmount");

        balances[msg.sender] += msg.value;

        participants.push(msg.sender);

    }

    function distributeFunds() public {

        require(msg.sender == owner, "Only contract owner can distribute funds");

        uint256 len = participants.length;

        address[] memory winners = new address[](len/2);

        for (uint256 i = 0; i < len/2; i++) {

            address winner1 = participants[i*2];

            address winner2 = participants[i*2+1];

            uint256 amount = pairAmount;

            if (balances[winner1] < pairAmount || balances[winner2] < pairAmount) {

                continue;

            }

            

            balances[winner1] -= pairAmount;

            balances[winner2] -= pairAmount;

            winners[i] = winner1;

            winners[i+1] = winner2;

        }

}