hdu 2844 Coins 多重背包模板题 ，二进制优化。据说是楼教主的男人八题之一Coins
Whuacmers use coins.They have coins of value A1,A2,A3...An Silverland dollar. One day Hibix opened purse and found there were some coins. He decided to buy a very nice watch in a nearby shop. He wanted to pay the exact price(without change) and he kn
