importPackage(java.io);
importPackage(java.lang);

// your code goes here
// Solidity smart contract code
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract RealEstate {
    struct Property {
        string name;
        uint price;
        address[] owners;
        uint[] ownership;
    }

    mapping(uint => Property) public properties;
    mapping(uint => mapping(address => uint)) public ownerships;

    function createProperty(uint id, string memory name, uint price) public {
        properties[id] = Property(name, price, new address[](0), new uint[](0));
    }

    function buyOwnership(uint id, uint percentage) public payable {
        require(properties[id].price * percentage / 100 == msg.value, "Incorrect value sent");
        require(percentage > 0 && percentage <= 100, "Invalid percentage");

        uint ownership = properties[id].ownership.length;
        properties[id].ownership.push(percentage);
        properties[id].owners.push(msg.sender);
        ownerships[id][msg.sender] = ownership;
    }

    function sellOwnership(uint id, uint percentage) public {
        uint index = ownerships[id][msg.sender];
        require(properties[id].ownership[index] == percentage, "Ownership percentage mismatch");
        require(percentage > 0 && percentage <= 100, "Invalid percentage");

        uint value = properties[id].price * percentage / 100;
        properties[id].ownership[index] = 0;
        ownerships[id][msg.sender] = 0;
        properties[id].owners[index] = properties[id].owners[properties[id].owners.length - 1];
        properties[id].owners.pop();

        (bool success, ) = payable(msg.sender).call{value: value}("");
        require(success, "Transfer failed.");
    }
}