Multisend

Multisend.sol

pragma solidity ^0.5.7;

contract Token {
    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;
    
    event Transfer(address indexed from, address indexed to, uint256 amount);
    
    function transfer(address to, uint256 amount) public returns(bool) {
        _transfer(msg.sender, to, amount);
        return true;
    }
    
    function approve(address to, uint256 amount) public returns(bool) {
        allowance[msg.sender][to] = amount;
        return true;
    }
    
    function transferFrom(address from, address to, uint256 amount) public returns(bool) {
        require(allowance[from][msg.sender] >= amount);
        allowance[from][msg.sender] -= amount;
        _transfer(from, to, amount);
    }
    
    function _transfer(address from, address to, uint256 amount) internal {
        require(balanceOf[from] >= amount);
        balanceOf[from] -= amount;
        balanceOf[to] += amount;
        emit Transfer(from, to, amount);
    }
    
    constructor() public {
        balanceOf[msg.sender] = 1000000;
    }
}

contract Multisend {
    Token public _token;
    
    constructor() public {
        _token = new Token();
    }
    
    function f(address[] calldata tos, uint256[] calldata amounts) external {
        Token token = _token;
        for (uint i = 0; i < tos.length; i++) {
            token.transfer(tos[i], amounts[i]);
        }
    }
    
    function g(bytes calldata data) external {
        Token token = _token;
        bytes memory arg = new bytes(68);
        for (uint256 i = 0; i < data.length; i += 68) {
            assembly {
                calldatacopy(add(32, arg), add(0x44, i), 68)
                let b := call(gas, token, 0, add(32, arg), 68, 0, 0)
            }
        }
    }
    
    function g2(bytes memory data) public {
        Token token = _token;
        for (uint256 i = 0; i < data.length; i += 68) {
            assembly {
                let b := call(gas, token, 0, add(add(32, data), i), 68, 0, 0)
            }
        }
    }
}

// ["0xca35b7d915458ef540ade6068dfe2f44e8fa7335", "0xca35b7d915458ef540ade6068dfe2f44e8fa733c", "0xca35b7d915458ef540ade6068dfe2f44e8fa733d", "0xca35b7d915458ef540ade6068dfe2f44e8fa733e", "0xca35b7d915458ef540ade6068dfe2f44e8fa7330"], [1,2,3,4,5]

// 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