POJ1054总结 The Troublesome Frog 搜索 剪枝
POJ1024总结 Tester Program 唯一最短路径 宽搜
POJ2426总结 Remainder 宽搜
POJ2381总结 Random Gap
POJ2183总结 Bovine Math Geniuses
POJ2182总结 Lost Cows 找规律
POJ2157总结 Maze 宽搜