// SPDX-License-Identifier: MIT

pragma solidity ^0.8.7;

contract OrangeManSummer {
    mapping(address => uint256) private balances;
    mapping(address => mapping(address => uint256)) private allowances;

    string private constant NAME = "Orange Man Summer";
    string private constant SYMBOL = "OMS";
    uint8 private constant DECIMALS = 18;
    uint256 private constant TOTAL_SUPPLY = 10_000_000_000 * 10**DECIMALS;

    event Transfer(address indexed sender, address indexed receiver, uint256 value);
    event Approval(address indexed owner, address indexed delegate, uint256 value);

    constructor() {
        balances[msg.sender] = TOTAL_SUPPLY;
        emit Transfer(address(0), msg.sender, TOTAL_SUPPLY);
    }

    function name() external pure returns (string memory) {
        return NAME;
    }

    function symbol() external pure returns (string memory) {
        return SYMBOL;
    }

    function decimals() external pure returns (uint8) {
        return DECIMALS;
    }

    function totalSupply() external pure returns (uint256) {
        return TOTAL_SUPPLY;
    }

    function balanceOf(address account) external view returns (uint256) {
        return balances[account];
    }

    function transfer(address to, uint256 amount) external returns (bool) {
        address sender = msg.sender;
        require(sender != to, "ERC20: transfer to self");
        _transfer(sender, to, amount);
        return true;
    }

    function allowance(address owner, address spender) public view returns (uint256) {
        return allowances[owner][spender];
    }

    function approve(address spender, uint256 amount) external returns (bool) {
        address owner = msg.sender;
        _approve(owner, spender, amount);
        return true;
    }

    function transferFrom(address from, address to, uint256 amount) external returns (bool) {
        address spender = msg.sender;
        require(spender != from, "ERC20: spender cannot be sender");
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue) external returns (bool) {
        address owner = msg.sender;
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) external returns (bool) {
        address owner = msg.sender;
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }
        return true;
    }

    function _transfer(address from, address to, uint256 amount) internal {
        require(from != address(0), "ERC20: transfer from zero address");
        require(to != address(0), "ERC20: transfer to zero address");
        require(amount > 0, "ERC20: amount must be greater than zero");

        uint256 fromBalance = balances[from];
        require(fromBalance >= amount, "ERC20: transfer exceeds balance");
        unchecked {
            balances[from] = fromBalance - amount;
        }
        balances[to] += amount;

        emit Transfer(from, to, amount);
    }

    function _approve(address owner, address spender, uint256 amount) internal {
        require(owner != address(0), "ERC20: approve from zero address");
        require(spender != address(0), "ERC20: approve to zero address");

        allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    function _spendAllowance(address owner, address spender, uint256 amount) internal {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }
}

{
  "compilationTarget": {
    "OrangeManSummer.sol": "OrangeManSummer"
  },
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}