农场主John需要修复围栏，购买了一块长木板，需要锯成N块，每块长度不同。Don农场主提供锯子服务，按木材长度收费。任务是帮助John确定最节省成本的锯木头顺序，输出最小总花费。
Fence Repair（优先队列）每一次都排序
Farmer John wants to repair a small length of the fence around the pasture. He measures the fence and finds that he needs N (1 ≤ N ≤ 20,000) planks of wood, each having some integer length Li (1 ≤ Li ≤ 50,000) units. He then purchases a single long board just long enough to saw into the N planks (i.e., whose length is the sum of the lengths Li). FJ is ignoring the "kerf", the extra length lost to sawdust when a sawcut is made; you should ignore it, too.
FJ sadly realizes that he doesn't own a saw with which to cut the wood, so he mosies over to Farmer Don's Farm with this long board and politely asks if he
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