//Write your own contracts here. Currently compiles using solc v0.4.15+commit.bbb8e64f. pragma solidity ^0.4.18; contract Token { mapping (address => uint) public balances; function transfer(address to, uint amount) public { require(balances[msg.sender] >= amount); balances[msg.sender] -= amount; balances[to] += amount; } } 0.4.25