1618: [Usaco2008 Nov]Buying Hay 购买干草 Time Limit: 5 Sec Memory Limit: 64 MB Submit: 906 Solved: 456 [Submit][Status][Discuss] Description  约翰的干草库存已经告罄，他打算为奶牛们采购日(1≤日≤50000)磅干草．  他知道N(1≤N≤100)个干草公司，现在用1到N给它们编号．第i个公司卖的干草包重量为Pi(1≤Pi≤5000)磅，需要的开销为Ci(l≤Ci≤5000)美元．每个干草公司的货源都十分充足，可以卖出无限多的干草包． 帮助约翰找到最小的开销来满足需要，即采购到至少H磅干草． Input …

F - Piggy-Bank **Time Limit:**1000MS **Memory Limit:**32768KB 64bit IO Format:%I64d & %I64u Submit Status Description Before ACM can do anything, a budget must be prepared and the necessary financial support obtained. The main income for this action comes from Irreversibly Bound Money (IBM). The idea behind is …