// File: contracts/ZooZooos.sol



// SPDX-License-Identifier: MIT                                                                                        
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//;   |  .'                       ;   |  .'                                    `--'---'   
//`---'                           `---'                                                   
//                                                                                        
//                                                                                                                                                               
// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
 bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

 /**
 * @dev Converts a `uint256` to its ASCII `string` decimal representation.
 */
 function toString(uint256 value) internal pure returns (string memory) {
 // Inspired by OraclizeAPI's implementation - MIT licence
 // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

 if (value == 0) {
 return "0";
 }
 uint256 temp = value;
 uint256 digits;
 while (temp != 0) {
 digits++;
 temp /= 10;
 }
 bytes memory buffer = new bytes(digits);
 while (value != 0) {
 digits -= 1;
 buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
 value /= 10;
 }
 return string(buffer);
 }

 /**
 * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
 */
 function toHexString(uint256 value) internal pure returns (string memory) {
 if (value == 0) {
 return "0x00";
 }
 uint256 temp = value;
 uint256 length = 0;
 while (temp != 0) {
 length++;
 temp >>= 8;
 }
 return toHexString(value, length);
 }

 /**
 * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
 */
 function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
 bytes memory buffer = new bytes(2 * length + 2);
 buffer[0] = "0";
 buffer[1] = "x";
 for (uint256 i = 2 * length + 1; i > 1; --i) {
 buffer[i] = _HEX_SYMBOLS[value & 0xf];
 value >>= 4;
 }
 require(value == 0, "Strings: hex length insufficient");
 return string(buffer);
 }
}

// File: @openzeppelin/contracts/utils/Address.sol


// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
 /**
 * @dev Returns true if `account` is a contract.
 *
 * [IMPORTANT]
 * ====
 * It is unsafe to assume that an address for which this function returns
 * false is an externally-owned account (EOA) and not a contract.
 *
 * Among others, `isContract` will return false for the following
 * types of addresses:
 *
 * - an externally-owned account
 * - a contract in construction
 * - an address where a contract will be created
 * - an address where a contract lived, but was destroyed
 * ====
 *
 * [IMPORTANT]
 * ====
 * You shouldn't rely on `isContract` to protect against flash loan attacks!
 *
 * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
 * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
 * constructor.
 * ====
 */
 function isContract(address account) internal view returns (bool) {
 // This method relies on extcodesize/address.code.length, which returns 0
 // for contracts in construction, since the code is only stored at the end
 // of the constructor execution.

 return account.code.length > 0;
 }

 /**
 * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
 * `recipient`, forwarding all available gas and reverting on errors.
 *
 * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
 * of certain opcodes, possibly making contracts go over the 2300 gas limit
 * imposed by `transfer`, making them unable to receive funds via
 * `transfer`. {sendValue} removes this limitation.
 *
 * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
 *
 * IMPORTANT: because control is transferred to `recipient`, care must be
 * taken to not create reentrancy vulnerabilities. Consider using
 * {ReentrancyGuard} or the
 * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
 */
 function sendValue(address payable recipient, uint256 amount) internal {
 require(address(this).balance >= amount, "Address: insufficient balance");

 (bool success, ) = recipient.call{value: amount}("");
 require(success, "Address: unable to send value, recipient may have reverted");
 }

 /**
 * @dev Performs a Solidity function call using a low level `call`. A
 * plain `call` is an unsafe replacement for a function call: use this
 * function instead.
 *
 * If `target` reverts with a revert reason, it is bubbled up by this
 * function (like regular Solidity function calls).
 *
 * Returns the raw returned data. To convert to the expected return value,
 * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
 *
 * Requirements:
 *
 * - `target` must be a contract.
 * - calling `target` with `data` must not revert.
 *
 * _Available since v3.1._
 */
 function functionCall(address target, bytes memory data) internal returns (bytes memory) {
 return functionCall(target, data, "Address: low-level call failed");
 }

 /**
 * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
 * `errorMessage` as a fallback revert reason when `target` reverts.
 *
 * _Available since v3.1._
 */
 function functionCall(
 address target,
 bytes memory data,
 string memory errorMessage
 ) internal returns (bytes memory) {
 return functionCallWithValue(target, data, 0, errorMessage);
 }

 /**
 * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
 * but also transferring `value` wei to `target`.
 *
 * Requirements:
 *
 * - the calling contract must have an ETH balance of at least `value`.
 * - the called Solidity function must be `payable`.
 *
 * _Available since v3.1._
 */
 function functionCallWithValue(
 address target,
 bytes memory data,
 uint256 value
 ) internal returns (bytes memory) {
 return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
 }

 /**
 * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
 * with `errorMessage` as a fallback revert reason when `target` reverts.
 *
 * _Available since v3.1._
 */
 function functionCallWithValue(
 address target,
 bytes memory data,
 uint256 value,
 string memory errorMessage
 ) internal returns (bytes memory) {
 require(address(this).balance >= value, "Address: insufficient balance for call");
 require(isContract(target), "Address: call to non-contract");

 (bool success, bytes memory returndata) = target.call{value: value}(data);
 return verifyCallResult(success, returndata, errorMessage);
 }

 /**
 * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
 * but performing a static call.
 *
 * _Available since v3.3._
 */
 function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
 return functionStaticCall(target, data, "Address: low-level static call failed");
 }

 /**
 * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
 * but performing a static call.
 *
 * _Available since v3.3._
 */
 function functionStaticCall(
 address target,
 bytes memory data,
 string memory errorMessage
 ) internal view returns (bytes memory) {
 require(isContract(target), "Address: static call to non-contract");

 (bool success, bytes memory returndata) = target.staticcall(data);
 return verifyCallResult(success, returndata, errorMessage);
 }

 /**
 * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
 * but performing a delegate call.
 *
 * _Available since v3.4._
 */
 function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
 return functionDelegateCall(target, data, "Address: low-level delegate call failed");
 }

 /**
 * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
 * but performing a delegate call.
 *
 * _Available since v3.4._
 */
 function functionDelegateCall(
 address target,
 bytes memory data,
 string memory errorMessage
 ) internal returns (bytes memory) {
 require(isContract(target), "Address: delegate call to non-contract");

 (bool success, bytes memory returndata) = target.delegatecall(data);
 return verifyCallResult(success, returndata, errorMessage);
 }

 /**
 * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
 * revert reason using the provided one.
 *
 * _Available since v4.3._
 */
 function verifyCallResult(
 bool success,
 bytes memory returndata,
 string memory errorMessage
 ) internal pure returns (bytes memory) {
 if (success) {
 return returndata;
 } else {
 // Look for revert reason and bubble it up if present
 if (returndata.length > 0) {
 // The easiest way to bubble the revert reason is using memory via assembly

 assembly {
 let returndata_size := mload(returndata)
 revert(add(32, returndata), returndata_size)
 }
 } else {
 revert(errorMessage);
 }
 }
 }
}

// File: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol


// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
 /**
 * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
 * by `operator` from `from`, this function is called.
 *
 * It must return its Solidity selector to confirm the token transfer.
 * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
 *
 * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.
 */
 function onERC721Received(
 address operator,
 address from,
 uint256 tokenId,
 bytes calldata data
 ) external returns (bytes4);
}

// File: @openzeppelin/contracts/utils/introspection/IERC165.sol


// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
 /**
 * @dev Returns true if this contract implements the interface defined by
 * `interfaceId`. See the corresponding
 * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
 * to learn more about how these ids are created.
 *
 * This function call must use less than 30 000 gas.
 */
 function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// File: @openzeppelin/contracts/utils/introspection/ERC165.sol


// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;


/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 * return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
 /**
 * @dev See {IERC165-supportsInterface}.
 */
 function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 return interfaceId == type(IERC165).interfaceId;
 }
}

// File: @openzeppelin/contracts/token/ERC721/IERC721.sol


// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;


/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
 /**
 * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
 */
 event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

 /**
 * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
 */
 event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

 /**
 * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
 */
 event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

 /**
 * @dev Returns the number of tokens in ``owner``'s account.
 */
 function balanceOf(address owner) external view returns (uint256 balance);

 /**
 * @dev Returns the owner of the `tokenId` token.
 *
 * Requirements:
 *
 * - `tokenId` must exist.
 */
 function ownerOf(uint256 tokenId) external view returns (address owner);

 /**
 * @dev Safely transfers `tokenId` token from `from` to `to`.
 *
 * Requirements:
 *
 * - `from` cannot be the zero address.
 * - `to` cannot be the zero address.
 * - `tokenId` token must exist and be owned by `from`.
 * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
 * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
 *
 * Emits a {Transfer} event.
 */
 function safeTransferFrom(
 address from,
 address to,
 uint256 tokenId,
 bytes calldata data
 ) external;

 /**
 * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
 * are aware of the ERC721 protocol to prevent tokens from being forever locked.
 *
 * Requirements:
 *
 * - `from` cannot be the zero address.
 * - `to` cannot be the zero address.
 * - `tokenId` token must exist and be owned by `from`.
 * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
 * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
 *
 * Emits a {Transfer} event.
 */
 function safeTransferFrom(
 address from,
 address to,
 uint256 tokenId
 ) external;

 /**
 * @dev Transfers `tokenId` token from `from` to `to`.
 *
 * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
 *
 * Requirements:
 *
 * - `from` cannot be the zero address.
 * - `to` cannot be the zero address.
 * - `tokenId` token must be owned by `from`.
 * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
 *
 * Emits a {Transfer} event.
 */
 function transferFrom(
 address from,
 address to,
 uint256 tokenId
 ) external;

 /**
 * @dev Gives permission to `to` to transfer `tokenId` token to another account.
 * The approval is cleared when the token is transferred.
 *
 * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
 *
 * Requirements:
 *
 * - The caller must own the token or be an approved operator.
 * - `tokenId` must exist.
 *
 * Emits an {Approval} event.
 */
 function approve(address to, uint256 tokenId) external;

 /**
 * @dev Approve or remove `operator` as an operator for the caller.
 * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
 *
 * Requirements:
 *
 * - The `operator` cannot be the caller.
 *
 * Emits an {ApprovalForAll} event.
 */
 function setApprovalForAll(address operator, bool _approved) external;

 /**
 * @dev Returns the account approved for `tokenId` token.
 *
 * Requirements:
 *
 * - `tokenId` must exist.
 */
 function getApproved(uint256 tokenId) external view returns (address operator);

 /**
 * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
 *
 * See {setApprovalForAll}
 */
 function isApprovedForAll(address owner, address operator) external view returns (bool);
}

// File: @openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol


// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;


/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
 /**
 * @dev Returns the token collection name.
 */
 function name() external view returns (string memory);

 /**
 * @dev Returns the token collection symbol.
 */
 function symbol() external view returns (string memory);

 /**
 * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
 */
 function tokenURI(uint256 tokenId) external view returns (string memory);
}

// File: @openzeppelin/contracts/utils/Context.sol


// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
 function _msgSender() internal view virtual returns (address) {
 return msg.sender;
 }

 function _msgData() internal view virtual returns (bytes calldata) {
 return msg.data;
 }
}

// File: ERC721A.sol


// Creator: Chiru Labs

pragma solidity ^0.8.7;

error ApprovalCallerNotOwnerNorApproved();
error ApprovalQueryForNonexistentToken();
error ApproveToCaller();
error ApprovalToCurrentOwner();
error BalanceQueryForZeroAddress();
error MintToZeroAddress();
error MintZeroQuantity();
error OwnerQueryForNonexistentToken();
error TransferCallerNotOwnerNorApproved();
error TransferFromIncorrectOwner();
error TransferToNonERC721ReceiverImplementer();
error TransferToZeroAddress();
error URIQueryForNonexistentToken();

/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension. Built to optimize for lower gas during batch mints.
 *
 * Assumes serials are sequentially minted starting at _startTokenId() (defaults to 0, e.g. 0, 1, 2, 3..).
 *
 * Assumes that an owner cannot have more than 2**64 - 1 (max value of uint64) of supply.
 *
 * Assumes that the maximum token id cannot exceed 2**256 - 1 (max value of uint256).
 */
contract ERC721A is Context, ERC165, IERC721, IERC721Metadata {
 using Address for address;
 using Strings for uint256;

 // Compiler will pack this into a single 256bit word.
 struct TokenOwnership {
 // The address of the owner.
 address addr;
 // Keeps track of the start time of ownership with minimal overhead for tokenomics.
 uint64 startTimestamp;
 // Whether the token has been burned.
 bool burned;
 }

 // Compiler will pack this into a single 256bit word.
 struct AddressData {
 // Realistically, 2**64-1 is more than enough.
 uint64 balance;
 // Keeps track of mint count with minimal overhead for tokenomics.
 uint64 numberMinted;
 // Keeps track of burn count with minimal overhead for tokenomics.
 uint64 numberBurned;
 // For miscellaneous variable(s) pertaining to the address
 // (e.g. number of whitelist mint slots used).
 // If there are multiple variables, please pack them into a uint64.
 uint64 aux;
 }

 // The tokenId of the next token to be minted.
 uint256 internal _currentIndex;

 // The number of tokens burned.
 uint256 internal _burnCounter;

 // Token name
 string private _name;

 // Token symbol
 string private _symbol;

 // Mapping from token ID to ownership details
 // An empty struct value does not necessarily mean the token is unowned. See _ownershipOf implementation for details.
 mapping(uint256 => TokenOwnership) internal _ownerships;

 // Mapping owner address to address data
 mapping(address => AddressData) private _addressData;

 // Mapping from token ID to approved address
 mapping(uint256 => address) private _tokenApprovals;

 // Mapping from owner to operator approvals
 mapping(address => mapping(address => bool)) private _operatorApprovals;

 constructor(string memory name_, string memory symbol_) {
 _name = name_;
 _symbol = symbol_;
 _currentIndex = _startTokenId();
 }

 /**
 * To change the starting tokenId, please override this function.
 */
 function _startTokenId() internal view virtual returns (uint256) {
 return 0;
 }

 /**
 * @dev Burned tokens are calculated here, use _totalMinted() if you want to count just minted tokens.
 */
 function totalSupply() public view returns (uint256) {
 // Counter underflow is impossible as _burnCounter cannot be incremented
 // more than _currentIndex - _startTokenId() times
 unchecked {
 return _currentIndex - _burnCounter - _startTokenId();
 }
 }

 /**
 * Returns the total amount of tokens minted in the contract.
 */
 function _totalMinted() internal view returns (uint256) {
 // Counter underflow is impossible as _currentIndex does not decrement,
 // and it is initialized to _startTokenId()
 unchecked {
 return _currentIndex - _startTokenId();
 }
 }

 /**
 * @dev See {IERC165-supportsInterface}.
 */
 function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
 return
 interfaceId == type(IERC721).interfaceId ||
 interfaceId == type(IERC721Metadata).interfaceId ||
 super.supportsInterface(interfaceId);
 }

 /**
 * @dev See {IERC721-balanceOf}.
 */
 function balanceOf(address owner) public view override returns (uint256) {
 if (owner == address(0)) revert BalanceQueryForZeroAddress();
 return uint256(_addressData[owner].balance);
 }

 /**
 * Returns the number of tokens minted by `owner`.
 */
 function _numberMinted(address owner) internal view returns (uint256) {
 return uint256(_addressData[owner].numberMinted);
 }

 /**
 * Returns the number of tokens burned by or on behalf of `owner`.
 */
 function _numberBurned(address owner) internal view returns (uint256) {
 return uint256(_addressData[owner].numberBurned);
 }

 /**
 * Returns the auxillary data for `owner`. (e.g. number of whitelist mint slots used).
 */
 function _getAux(address owner) internal view returns (uint64) {
 return _addressData[owner].aux;
 }

 /**
 * Sets the auxillary data for `owner`. (e.g. number of whitelist mint slots used).
 * If there are multiple variables, please pack them into a uint64.
 */
 function _setAux(address owner, uint64 aux) internal {
 _addressData[owner].aux = aux;
 }

 /**
 * Gas spent here starts off proportional to the maximum mint batch size.
 * It gradually moves to O(1) as tokens get transferred around in the collection over time.
 */
 function _ownershipOf(uint256 tokenId) internal view returns (TokenOwnership memory) {
 uint256 curr = tokenId;

 unchecked {
 if (_startTokenId() <= curr && curr < _currentIndex) {
 TokenOwnership memory ownership = _ownerships[curr];
 if (!ownership.burned) {
 if (ownership.addr != address(0)) {
 return ownership;
 }
 // Invariant:
 // There will always be an ownership that has an address and is not burned
 // before an ownership that does not have an address and is not burned.
 // Hence, curr will not underflow.
 while (true) {
 curr--;
 ownership = _ownerships[curr];
 if (ownership.addr != address(0)) {
 return ownership;
 }
 }
 }
 }
 }
 revert OwnerQueryForNonexistentToken();
 }

 /**
 * @dev See {IERC721-ownerOf}.
 */
 function ownerOf(uint256 tokenId) public view override returns (address) {
 return _ownershipOf(tokenId).addr;
 }

 /**
 * @dev See {IERC721Metadata-name}.
 */
 function name() public view virtual override returns (string memory) {
 return _name;
 }

 /**
 * @dev See {IERC721Metadata-symbol}.
 */
 function symbol() public view virtual override returns (string memory) {
 return _symbol;
 }

 /**
 * @dev See {IERC721Metadata-tokenURI}.
 */
 function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
 if (!_exists(tokenId)) revert URIQueryForNonexistentToken();

 string memory baseURI = _baseURI();
 return bytes(baseURI).length != 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : '';
 }

 /**
 * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
 * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
 * by default, can be overriden in child contracts.
 */
 function _baseURI() internal view virtual returns (string memory) {
 return '';
 }

 /**
 * @dev See {IERC721-approve}.
 */
 function approve(address to, uint256 tokenId) public override {
 address owner = ERC721A.ownerOf(tokenId);
 if (to == owner) revert ApprovalToCurrentOwner();

 if (_msgSender() != owner && !isApprovedForAll(owner, _msgSender())) {
 revert ApprovalCallerNotOwnerNorApproved();
 }

 _approve(to, tokenId, owner);
 }

 /**
 * @dev See {IERC721-getApproved}.
 */
 function getApproved(uint256 tokenId) public view override returns (address) {
 if (!_exists(tokenId)) revert ApprovalQueryForNonexistentToken();

 return _tokenApprovals[tokenId];
 }

 /**
 * @dev See {IERC721-setApprovalForAll}.
 */
 function setApprovalForAll(address operator, bool approved) public virtual override {
 if (operator == _msgSender()) revert ApproveToCaller();

 _operatorApprovals[_msgSender()][operator] = approved;
 emit ApprovalForAll(_msgSender(), operator, approved);
 }

 /**
 * @dev See {IERC721-isApprovedForAll}.
 */
 function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
 return _operatorApprovals[owner][operator];
 }

 /**
 * @dev See {IERC721-transferFrom}.
 */
 function transferFrom(
 address from,
 address to,
 uint256 tokenId
 ) public virtual override {
 _transfer(from, to, tokenId);
 }

 /**
 * @dev See {IERC721-safeTransferFrom}.
 */
 function safeTransferFrom(
 address from,
 address to,
 uint256 tokenId
 ) public virtual override {
 safeTransferFrom(from, to, tokenId, '');
 }

 /**
 * @dev See {IERC721-safeTransferFrom}.
 */
 function safeTransferFrom(
 address from,
 address to,
 uint256 tokenId,
 bytes memory _data
 ) public virtual override {
 _transfer(from, to, tokenId);
 if (to.isContract() && !_checkContractOnERC721Received(from, to, tokenId, _data)) {
 revert TransferToNonERC721ReceiverImplementer();
 }
 }

 /**
 * @dev Returns whether `tokenId` exists.
 *
 * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
 *
 * Tokens start existing when they are minted (`_mint`),
 */
 function _exists(uint256 tokenId) internal view returns (bool) {
 return _startTokenId() <= tokenId && tokenId < _currentIndex && !_ownerships[tokenId].burned;
 }

 /**
 * @dev Equivalent to `_safeMint(to, quantity, '')`.
 */
 function _safeMint(address to, uint256 quantity) internal {
 _safeMint(to, quantity, '');
 }

 /**
 * @dev Safely mints `quantity` tokens and transfers them to `to`.
 *
 * Requirements:
 *
 * - If `to` refers to a smart contract, it must implement 
 * {IERC721Receiver-onERC721Received}, which is called for each safe transfer.
 * - `quantity` must be greater than 0.
 *
 * Emits a {Transfer} event.
 */
 function _safeMint(
 address to,
 uint256 quantity,
 bytes memory _data
 ) internal {
 uint256 startTokenId = _currentIndex;
 if (to == address(0)) revert MintToZeroAddress();
 if (quantity == 0) revert MintZeroQuantity();

 _beforeTokenTransfers(address(0), to, startTokenId, quantity);

 // Overflows are incredibly unrealistic.
 // balance or numberMinted overflow if current value of either + quantity > 1.8e19 (2**64) - 1
 // updatedIndex overflows if _currentIndex + quantity > 1.2e77 (2**256) - 1
 unchecked {
 _addressData[to].balance += uint64(quantity);
 _addressData[to].numberMinted += uint64(quantity);

 _ownerships[startTokenId].addr = to;
 _ownerships[startTokenId].startTimestamp = uint64(block.timestamp);

 uint256 updatedIndex = startTokenId;
 uint256 end = updatedIndex + quantity;

 if (to.isContract()) {
 do {
 emit Transfer(address(0), to, updatedIndex);
 if (!_checkContractOnERC721Received(address(0), to, updatedIndex++, _data)) {
 revert TransferToNonERC721ReceiverImplementer();
 }
 } while (updatedIndex != end);
 // Reentrancy protection
 if (_currentIndex != startTokenId) revert();
 } else {
 do {
 emit Transfer(address(0), to, updatedIndex++);
 } while (updatedIndex != end);
 }
 _currentIndex = updatedIndex;
 }
 _afterTokenTransfers(address(0), to, startTokenId, quantity);
 }

 /**
 * @dev Mints `quantity` tokens and transfers them to `to`.
 *
 * Requirements:
 *
 * - `to` cannot be the zero address.
 * - `quantity` must be greater than 0.
 *
 * Emits a {Transfer} event.
 */
 function _mint(address to, uint256 quantity) internal {
 uint256 startTokenId = _currentIndex;
 if (to == address(0)) revert MintToZeroAddress();
 if (quantity == 0) revert MintZeroQuantity();

 _beforeTokenTransfers(address(0), to, startTokenId, quantity);

 // Overflows are incredibly unrealistic.
 // balance or numberMinted overflow if current value of either + quantity > 1.8e19 (2**64) - 1
 // updatedIndex overflows if _currentIndex + quantity > 1.2e77 (2**256) - 1
 unchecked {
 _addressData[to].balance += uint64(quantity);
 _addressData[to].numberMinted += uint64(quantity);

 _ownerships[startTokenId].addr = to;
 _ownerships[startTokenId].startTimestamp = uint64(block.timestamp);

 uint256 updatedIndex = startTokenId;
 uint256 end = updatedIndex + quantity;

 do {
 emit Transfer(address(0), to, updatedIndex++);
 } while (updatedIndex != end);

 _currentIndex = updatedIndex;
 }
 _afterTokenTransfers(address(0), to, startTokenId, quantity);
 }

 /**
 * @dev Transfers `tokenId` from `from` to `to`.
 *
 * Requirements:
 *
 * - `to` cannot be the zero address.
 * - `tokenId` token must be owned by `from`.
 *
 * Emits a {Transfer} event.
 */
 function _transfer(
 address from,
 address to,
 uint256 tokenId
 ) private {
 TokenOwnership memory prevOwnership = _ownershipOf(tokenId);

 if (prevOwnership.addr != from) revert TransferFromIncorrectOwner();

 bool isApprovedOrOwner = (_msgSender() == from ||
 isApprovedForAll(from, _msgSender()) ||
 getApproved(tokenId) == _msgSender());

 if (!isApprovedOrOwner) revert TransferCallerNotOwnerNorApproved();
 if (to == address(0)) revert TransferToZeroAddress();

 _beforeTokenTransfers(from, to, tokenId, 1);

 // Clear approvals from the previous owner
 _approve(address(0), tokenId, from);

 // Underflow of the sender's balance is impossible because we check for
 // ownership above and the recipient's balance can't realistically overflow.
 // Counter overflow is incredibly unrealistic as tokenId would have to be 2**256.
 unchecked {
 _addressData[from].balance -= 1;
 _addressData[to].balance += 1;

 TokenOwnership storage currSlot = _ownerships[tokenId];
 currSlot.addr = to;
 currSlot.startTimestamp = uint64(block.timestamp);

 // If the ownership slot of tokenId+1 is not explicitly set, that means the transfer initiator owns it.
 // Set the slot of tokenId+1 explicitly in storage to maintain correctness for ownerOf(tokenId+1) calls.
 uint256 nextTokenId = tokenId + 1;
 TokenOwnership storage nextSlot = _ownerships[nextTokenId];
 if (nextSlot.addr == address(0)) {
 // This will suffice for checking _exists(nextTokenId),
 // as a burned slot cannot contain the zero address.
 if (nextTokenId != _currentIndex) {
 nextSlot.addr = from;
 nextSlot.startTimestamp = prevOwnership.startTimestamp;
 }
 }
 }

 emit Transfer(from, to, tokenId);
 _afterTokenTransfers(from, to, tokenId, 1);
 }

 /**
 * @dev Equivalent to `_burn(tokenId, false)`.
 */
 function _burn(uint256 tokenId) internal virtual {
 _burn(tokenId, false);
 }

 /**
 * @dev Destroys `tokenId`.
 * The approval is cleared when the token is burned.
 *
 * Requirements:
 *
 * - `tokenId` must exist.
 *
 * Emits a {Transfer} event.
 */
 function _burn(uint256 tokenId, bool approvalCheck) internal virtual {
 TokenOwnership memory prevOwnership = _ownershipOf(tokenId);

 address from = prevOwnership.addr;

 if (approvalCheck) {
 bool isApprovedOrOwner = (_msgSender() == from ||
 isApprovedForAll(from, _msgSender()) ||
 getApproved(tokenId) == _msgSender());

 if (!isApprovedOrOwner) revert TransferCallerNotOwnerNorApproved();
 }

 _beforeTokenTransfers(from, address(0), tokenId, 1);

 // Clear approvals from the previous owner
 _approve(address(0), tokenId, from);

 // Underflow of the sender's balance is impossible because we check for
 // ownership above and the recipient's balance can't realistically overflow.
 // Counter overflow is incredibly unrealistic as tokenId would have to be 2**256.
 unchecked {
 AddressData storage addressData = _addressData[from];
 addressData.balance -= 1;
 addressData.numberBurned += 1;

 // Keep track of who burned the token, and the timestamp of burning.
 TokenOwnership storage currSlot = _ownerships[tokenId];
 currSlot.addr = from;
 currSlot.startTimestamp = uint64(block.timestamp);
 currSlot.burned = true;

 // If the ownership slot of tokenId+1 is not explicitly set, that means the burn initiator owns it.
 // Set the slot of tokenId+1 explicitly in storage to maintain correctness for ownerOf(tokenId+1) calls.
 uint256 nextTokenId = tokenId + 1;
 TokenOwnership storage nextSlot = _ownerships[nextTokenId];
 if (nextSlot.addr == address(0)) {
 // This will suffice for checking _exists(nextTokenId),
 // as a burned slot cannot contain the zero address.
 if (nextTokenId != _currentIndex) {
 nextSlot.addr = from;
 nextSlot.startTimestamp = prevOwnership.startTimestamp;
 }
 }
 }

 emit Transfer(from, address(0), tokenId);
 _afterTokenTransfers(from, address(0), tokenId, 1);

 // Overflow not possible, as _burnCounter cannot be exceed _currentIndex times.
 unchecked {
 _burnCounter++;
 }
 }

 /**
 * @dev Approve `to` to operate on `tokenId`
 *
 * Emits a {Approval} event.
 */
 function _approve(
 address to,
 uint256 tokenId,
 address owner
 ) private {
 _tokenApprovals[tokenId] = to;
 emit Approval(owner, to, tokenId);
 }

 /**
 * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target contract.
 *
 * @param from address representing the previous owner of the given token ID
 * @param to target address that will receive the tokens
 * @param tokenId uint256 ID of the token to be transferred
 * @param _data bytes optional data to send along with the call
 * @return bool whether the call correctly returned the expected magic value
 */
 function _checkContractOnERC721Received(
 address from,
 address to,
 uint256 tokenId,
 bytes memory _data
 ) private returns (bool) {
 try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
 return retval == IERC721Receiver(to).onERC721Received.selector;
 } catch (bytes memory reason) {
 if (reason.length == 0) {
 revert TransferToNonERC721ReceiverImplementer();
 } else {
 assembly {
 revert(add(32, reason), mload(reason))
 }
 }
 }
 }

 /**
 * @dev Hook that is called before a set of serially-ordered token ids are about to be transferred. This includes minting.
 * And also called before burning one token.
 *
 * startTokenId - the first token id to be transferred
 * quantity - the amount to be transferred
 *
 * Calling conditions:
 *
 * - When `from` and `to` are both non-zero, `from`'s `tokenId` will be
 * transferred to `to`.
 * - When `from` is zero, `tokenId` will be minted for `to`.
 * - When `to` is zero, `tokenId` will be burned by `from`.
 * - `from` and `to` are never both zero.
 */
 function _beforeTokenTransfers(
 address from,
 address to,
 uint256 startTokenId,
 uint256 quantity
 ) internal virtual {}

 /**
 * @dev Hook that is called after a set of serially-ordered token ids have been transferred. This includes
 * minting.
 * And also called after one token has been burned.
 *
 * startTokenId - the first token id to be transferred
 * quantity - the amount to be transferred
 *
 * Calling conditions:
 *
 * - When `from` and `to` are both non-zero, `from`'s `tokenId` has been
 * transferred to `to`.
 * - When `from` is zero, `tokenId` has been minted for `to`.
 * - When `to` is zero, `tokenId` has been burned by `from`.
 * - `from` and `to` are never both zero.
 */
 function _afterTokenTransfers(
 address from,
 address to,
 uint256 startTokenId,
 uint256 quantity
 ) internal virtual {}
}
// File: @openzeppelin/contracts/access/Ownable.sol


// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;


/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
 address private _owner;

 event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

 /**
 * @dev Initializes the contract setting the deployer as the initial owner.
 */
 constructor() {
 _transferOwnership(_msgSender());
 }

 /**
 * @dev Returns the address of the current owner.
 */
 function owner() public view virtual returns (address) {
 return _owner;
 }

 /**
 * @dev Throws if called by any account other than the owner.
 */
 modifier onlyOwner() {
 require(owner() == _msgSender(), "Ownable: caller is not the owner");
 _;
 }

 /**
 * @dev Leaves the contract without owner. It will not be possible to call
 * `onlyOwner` functions anymore. Can only be called by the current owner.
 *
 * NOTE: Renouncing ownership will leave the contract without an owner,
 * thereby removing any functionality that is only available to the owner.
 */
 function renounceOwnership() public virtual onlyOwner {
 _transferOwnership(address(0));
 }

 /**
 * @dev Transfers ownership of the contract to a new account (`newOwner`).
 * Can only be called by the current owner.
 */
 function transferOwnership(address newOwner) public virtual onlyOwner {
 require(newOwner != address(0), "Ownable: new owner is the zero address");
 _transferOwnership(newOwner);
 }

 /**
 * @dev Transfers ownership of the contract to a new account (`newOwner`).
 * Internal function without access restriction.
 */
 function _transferOwnership(address newOwner) internal virtual {
 address oldOwner = _owner;
 _owner = newOwner;
 emit OwnershipTransferred(oldOwner, newOwner);
 }
}


pragma solidity ^0.8.7;


// File @openzeppelin/contracts/interfaces/IERC2981.sol@v4.7.3


// OpenZeppelin Contracts (last updated v4.6.0) (interfaces/IERC2981.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface for the NFT Royalty Standard.
 *
 * A standardized way to retrieve royalty payment information for non-fungible tokens (NFTs) to enable universal
 * support for royalty payments across all NFT marketplaces and ecosystem participants.
 *
 * _Available since v4.5._
 */
interface IERC2981 is IERC165 {
 /**
 * @dev Returns how much royalty is owed and to whom, based on a sale price that may be denominated in any unit of
 * exchange. The royalty amount is denominated and should be paid in that same unit of exchange.
 */
 function royaltyInfo(uint256 tokenId, uint256 salePrice)
 external
 view
 returns (address receiver, uint256 royaltyAmount);
}


// File @openzeppelin/contracts/token/common/ERC2981.sol@v4.7.3


// OpenZeppelin Contracts (last updated v4.7.0) (token/common/ERC2981.sol)

pragma solidity ^0.8.0;


/**
 * @dev Implementation of the NFT Royalty Standard, a standardized way to retrieve royalty payment information.
 *
 * Royalty information can be specified globally for all token ids via {_setDefaultRoyalty}, and/or individually for
 * specific token ids via {_setTokenRoyalty}. The latter takes precedence over the first.
 *
 * Royalty is specified as a fraction of sale price. {_feeDenominator} is overridable but defaults to 10000, meaning the
 * fee is specified in basis points by default.
 *
 * IMPORTANT: ERC-2981 only specifies a way to signal royalty information and does not enforce its payment. See
 * https://eips.ethereum.org/EIPS/eip-2981#optional-royalty-payments[Rationale] in the EIP. Marketplaces are expected to
 * voluntarily pay royalties together with sales, but note that this standard is not yet widely supported.
 *
 * _Available since v4.5._
 */
abstract contract ERC2981 is IERC2981, ERC165 {
 struct RoyaltyInfo {
 address receiver;
 uint96 royaltyFraction;
 }

 RoyaltyInfo private _defaultRoyaltyInfo;
 mapping(uint256 => RoyaltyInfo) private _tokenRoyaltyInfo;

 /**
 * @dev See {IERC165-supportsInterface}.
 */
 function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC165) returns (bool) {
 return interfaceId == type(IERC2981).interfaceId || super.supportsInterface(interfaceId);
 }

 /**
 * @inheritdoc IERC2981
 */
 function royaltyInfo(uint256 _tokenId, uint256 _salePrice) public view virtual override returns (address, uint256) {
 RoyaltyInfo memory royalty = _tokenRoyaltyInfo[_tokenId];

 if (royalty.receiver == address(0)) {
 royalty = _defaultRoyaltyInfo;
 }

 uint256 royaltyAmount = (_salePrice * royalty.royaltyFraction) / _feeDenominator();

 return (royalty.receiver, royaltyAmount);
 }

 /**
 * @dev The denominator with which to interpret the fee set in {_setTokenRoyalty} and {_setDefaultRoyalty} as a
 * fraction of the sale price. Defaults to 10000 so fees are expressed in basis points, but may be customized by an
 * override.
 */
 function _feeDenominator() internal pure virtual returns (uint96) {
 return 10000;
 }

 /**
 * @dev Sets the royalty information that all ids in this contract will default to.
 *
 * Requirements:
 *
 * - `receiver` cannot be the zero address.
 * - `feeNumerator` cannot be greater than the fee denominator.
 */
 function _setDefaultRoyalty(address receiver, uint96 feeNumerator) internal virtual {
 require(feeNumerator <= _feeDenominator(), "ERC2981: royalty fee will exceed salePrice");
 require(receiver != address(0), "ERC2981: invalid receiver");

 _defaultRoyaltyInfo = RoyaltyInfo(receiver, feeNumerator);
 }

 /**
 * @dev Removes default royalty information.
 */
 function _deleteDefaultRoyalty() internal virtual {
 delete _defaultRoyaltyInfo;
 }

 /**
 * @dev Sets the royalty information for a specific token id, overriding the global default.
 *
 * Requirements:
 *
 * - `receiver` cannot be the zero address.
 * - `feeNumerator` cannot be greater than the fee denominator.
 */
 function _setTokenRoyalty(
 uint256 tokenId,
 address receiver,
 uint96 feeNumerator
 ) internal virtual {
 require(feeNumerator <= _feeDenominator(), "ERC2981: royalty fee will exceed salePrice");
 require(receiver != address(0), "ERC2981: Invalid parameters");

 _tokenRoyaltyInfo[tokenId] = RoyaltyInfo(receiver, feeNumerator);
 }

 /**
 * @dev Resets royalty information for the token id back to the global default.
 */
 function _resetTokenRoyalty(uint256 tokenId) internal virtual {
 delete _tokenRoyaltyInfo[tokenId];
 }
}


contract Zoozooos is ERC721A, ERC2981, Ownable {

 string public baseURI = "ipfs://QmcU73y4THg1yuLRFponPMUQkkXPDRAzCky5WGqi1A6KCy/";
 uint256 public constant MAX_SUPPLY = 4444;
 uint256 public MINT_PRICE = 0.004 ether;
 uint256 public MAX_PER_TX = 5;
 uint256 public MAX_PER_TX_FREE = 1;
 uint96 public _rAm = 500;
 bool public isPublicSale = false;
 mapping(address => uint256) public _mintedFreeAmount;
 mapping(address => uint256) public _totalMintedAmount;
 uint public totalFreeMinted = 0;

 constructor() ERC721A("Zoozooos", "ZOZOS") {
 _setDefaultRoyalty(0x640280c039C5b993F902147360C784eA1E5f826C, _rAm);
 }

 function tokenURI(uint256 _tokenId) public view override returns (string memory) {
 require(_exists(_tokenId), "Token does not exist.");
 return string(abi.encodePacked(baseURI, Strings.toString(_tokenId), ".json"));
 }

 function setBaseURI(string memory _baseURI) external onlyOwner {
 baseURI = _baseURI;
 }

 function setFreeSupply(uint256 _freeSupply) public onlyOwner {
 MAX_PER_TX_FREE = _freeSupply;
 }

 function setMintPrice(uint256 _price) external onlyOwner {
 MINT_PRICE = _price;
 }

 function _startTokenId() internal view virtual override returns (uint256) {
 return 1;
 }

 function togglePublicSale(bool _isPublicSale) external onlyOwner {
 isPublicSale = _isPublicSale;
 }

 function setRoyaltyInfo(address receiver, uint96 feeBasisPoints)
 external
 onlyOwner
 {
 _setDefaultRoyalty(receiver, feeBasisPoints);
 }

 function supportsInterface(bytes4 interfaceId)
 public
 view
 override(ERC721A, ERC2981)
 returns (bool)
 {
 return super.supportsInterface(interfaceId);
 }

 function mint(uint256 count) external payable {
 require(isPublicSale, "Mint is not live yet");
 require(totalSupply() + count <= MAX_SUPPLY, "No more");
 require(count <= MAX_PER_TX, "Max per txn reached.");
 if(count >= (MAX_PER_TX_FREE - _mintedFreeAmount[msg.sender]))
 {
 require(msg.value >= (count * MINT_PRICE) - ((MAX_PER_TX_FREE - _mintedFreeAmount[msg.sender]) * MINT_PRICE), "You've already minted max free allocation or incorrect ETH sent");
 _mintedFreeAmount[msg.sender] = MAX_PER_TX_FREE;
 totalFreeMinted += MAX_PER_TX_FREE;
 }
 else if(count < (MAX_PER_TX_FREE - _mintedFreeAmount[msg.sender]))
 {
 require(msg.value >= 0, "Please send the exact ETH amount");
 _mintedFreeAmount[msg.sender] += count;
 totalFreeMinted += count;
 }
 // }
 else{
 require(isPublicSale, "Mint is not live yet");
 require(msg.value >= count * MINT_PRICE, "Please send the exact ETH amount");
 require(totalSupply() + count <= MAX_SUPPLY, "No more");
 require(count <= MAX_PER_TX, "Max per txn reached.");
 }
 _totalMintedAmount[msg.sender] += count;
 _safeMint(msg.sender, count);
 }

 function devMint(uint256 count) external onlyOwner {
 _safeMint(_msgSender(), count);
 }

 function withdrawMoney() external onlyOwner {
 (bool success, ) = _msgSender().call{value: address(this).balance}("");
 require(success, "Transfer failed.");
 }
}