BEC合约

合约地址：
https://etherscan.io/address/0xc5d105e63711398af9bbff092d4b6769c82f793d#code

function batchTransfer(address[] _receivers, uint256 _value) public whenNotPaused returns (bool) {
    uint cnt = _receivers.length;
    uint256 amount = uint256(cnt) * _value;  //value值很大，导致溢出
    require(cnt > 0 && cnt <= 20);
    require(_value > 0 && balances[msg.sender] >= amount); //这里判断通过

    balances[msg.sender] = balances[msg.sender].sub(amount);
    for (uint i = 0; i < cnt; i++) {
        balances[_receivers[i]] = balances[_receivers[i]].add(_value);//添加成功
        Transfer(msg.sender, _receivers[i], _value);
    }
    return true;
  }