victim.sol

pragma solidity ^0.4.24;

contract Victim {
  // gasless send error
  function withdraw0(uint n, address addr) payable {
    require(address(addr).send(n));
  }
  // reentrancy
  function withdraw1(uint n) payable {
    msg.sender.call.value(n)();
  }
  // delegate
  function delegate(address addr) {
    address(addr).delegatecall(msg.data);
  }
  // block.number
  function number(uint n, address addr) {
    if (block.number > 100) {
      address(addr).call.value(n)();
    }
  }
  // block.now
  function time(uint n, address addr) {
    if (now < 100) {
      address(addr).call.value(n)();
    }
  }
}