POJ 搜索题

一些好题目

POJ 1190 – 生日蛋糕(基础，好题)

http://acm.pku.edu.cn/JudgeOnline/problem?id=1190

题意：略
解法：dfs，题偏简单，但做出来还是有些感觉的

POJ 1376 – Robot(基础)

http://acm.pku.edu.cn/JudgeOnline/problem?id=1376

题意：略
解法：bfs，A*….

POJ 2688 – Cleaning Robot(基础)

http://acm.pku.edu.cn/JudgeOnline/problem?id=2688

题意：bfs后转换为tsp问题
解法：bfs+dp，bfs+dfs
相关：http://hi.baidu.com/zfy0701/blog/item/ceb06f261749a6128a82a1b2.html

POJ 3322 – Bloxorz I(基础)

http://acm.pku.edu.cn/JudgeOnline/problem?id=3322

题意：略，这个游戏本身很好玩http://jandan.net/2008/01/24/bloxorz.html
解法：广搜，双向广搜
相关：http://hi.baidu.com/zfy0701/blog/item/d7b6490f847948e8ab6457c6.html

POJ 2308 – Dearboy’s Puzzle(中等，但做的人少?)

http://acm.pku.edu.cn/JudgeOnline/problem?id=2308

题意：判断连连看是否有解
解法：DFS + BFS
相关：http://hi.baidu.com/zfy0701/blog/item/c62f41af65aa1fca7cd92afc.html

POJ 1324 – Holedox Moving(中等)

http://acm.pku.edu.cn/JudgeOnline/problem?id=1324

题意：略
解法：A*，dfs + 上界剪枝，广搜
相关：http://hi.baidu.com/zfy0701/blog/item/7fcaba2c3d5425e98a1399cf.html

http://hi.baidu.com/zfy0701/blog/item/a3c44ecc049b1c1501e92806.html

POJ 1084 – Square Destroyer(中等，经典题)

http://acm.pku.edu.cn/JudgeOnline/problem?id=1084

题意：把每个正方型看做集合中的元素，每个木棒看做是一个子集，求最小的子集覆盖
解法：dfs，A*，广搜肯定爆空间

POJ 2449 Remmarguts’ Date(中等，强烈推荐)

http://acm.pku.edu.cn/JudgeOnline/problem?id=2449

题意：经典问题：K短路
解法：dijkstra+A*，方法很多
相关：http://acm.pku.edu.cn/JudgeOnline/showcontest?contest_id=1144

POJ 2044 – Weather Forecast(中等)

http://acm.pku.edu.cn/JudgeOnline/problem?id=2044

题意：略
解法：广搜，dp，深搜
相关：http://hi.baidu.com/zfy0701/blog/item/d7b6490f847948e8ab6457c6.html

POJ 3635 full tank?(中等)

http://acm.pku.edu.cn/JudgeOnline/problem?id=3635

题意：最短路变形
解法：广搜
相关：http://hi.baidu.com/hnu_reason/blog/item/086e3dccfc8cb21600e9286b.html

POJ 3074 – Sudoku(中等)

http://acm.pku.edu.cn/JudgeOnline/problem?id=3074

题意：数独游戏，数据比2676强很多，但比3076弱
解法：用dfs回溯基本可过，不过每次应选择可能填的数字最少的格子搜
更快的方法是先转换成exact cover问题，然后用经典dancing links解决，
dancing links原始论文：http://lanl.arxiv.org/PS_cache/cs/pdf/0011/0011047v1.pdf
翻译：http://sqybi.com/works/dlxcn/

POJ 1475 – Pushing Boxes(中等，很推荐)

http://acm.pku.edu.cn/JudgeOnline/problem?id=1475

题意：推箱子游戏
解法：双重bfs(对箱子bfs 时 对人bfs)，A*

POJ 1077 – Eight(中等，此题不做人生不完整)

http://acm.pku.edu.cn/JudgeOnline/problem?id=1077

题意：八数码问题，超经典题
解法：广搜，A*，双向广搜

简单搜索

(1)深度优先搜索 (poj2488,poj3009,poj1321)

(2)广度优先搜索 (poj3278,poj1426,poj3126,poj3087.poj3414,poj2251,poj3083)

(3)简单搜索技巧和剪枝(poj2531,poj1416,poj2676,1129)

搜索、回溯、遍历

1022 1111 1118 1129 1190 1562 1564 1573 1655 2184 2225 2243 2312 2362 2378 2386
1010,1011,1018,1020,1054,1062,1256,1321,1363,1501，1650,1659,1664,1753,2078,208
3,2303,2310,2329

简单：1128, 1166, 1176, 1231, 1256, 1270, 1321, 1543, 1606, 1664, 1731, 1742, 17
45, 1847, 1915, 1950, 2038, 2157, 2182, 2183, 2381, 2386, 2426,
不易：1024, 1054, 1117, 1167, 1708, 1746, 1775, 1878, 1903, 1966, 2046, 2197, 23
49,
推荐：1011, 1190, 1191, 1416, 1579, 1632, 1639, 1659, 1680, 1683, 1691, 1709, 17
14, 1753, 1771, 1826, 1855, 1856, 1890, 1924, 1935, 1948, 1979, 1980, 2170, 2288
, 2331, 2339, 2340,1979（和迷宫类似） 1980（对剪枝要求较高）

1010 stamps
1011 sticks Accepted 
1020 Anniversary Cake
1022 Packing Unit 4D Cubes
1024 Tester Program
1054 The Troublesome Frog
1062 昂贵的聘礼
1069 The Bermuda Triangle
1072 Puzzle Out
1077 Eight Accepted 2006-08-19 16:16 A*，也可逆向搜索，预先算出所有状态
1084 Square Destroyer
1100 Dreisam Equations
1101 The Game (BFS) Accepted 2006-08-31 01:03简单题，非常普通的BFS
1110 Double Vision
1111 Image Perimeters
1117 Pairs of Integers
1118 Lining Up
1128 Frame Stacking Accepted 2006-07-29
1129 Channel Allocation（图的最大独立集）
1137 The New Villa (BFS) Accepted 2006-08-29 23:07
1142 Smith Numbers
1162 Building with Blocks
1164 The castle (DFS)
1166 The Cocks
1167 The buses
1176 Party Lamps 
1183 反正切函数的应用 Accepted 2006-08-30 22:27没劲~一道简单的数学推导题~
1184 聪明的打字员 Accepted 2006-08-17 06:18 如果觉得自己BFS的题做得差不多了,可以做一下这道题.作了这道题开始对BFS刮目相看了~花了整整一晚上写代码,改代码~
1190 生日蛋糕 搜索的步骤就是，从最低层开始，每一层从可能的最大半径一直枚举到最小可能半径，高度亦如此。一个参数表示层数，表示上一层的半径，高度，还是剩余体积，已有面积
1191 棋盘分割
1194 HIDDEN CODES 搜索+DP
1231 The Alphabet Game
1233 Street Crossing (BFS)
1248 Safecracker
1256 Anagram Accepted
1270 Following orders Accepted 2006-08-06 01:59 similar to toposort
1318 Word Amalgamation
1321 棋盘问题
1324 Holedox Moving (BFS)
1327 Moving Object Recognition Accepted 2006-08-22 01:11 Floodfill again
1338 Ugly Numbers
1363 Rails
1376 Robot Accepted 2006-08-13 06:52太阴险了，机器人起始位置和目的地可能重合,BFS
1416 Shredding Company Accepted
1465 Multiple Accepted 2006-08-05 15:21
1476 Always On the Run (BFS)
1480 Optimal Programs (BFS)
1482 It's not a Bug, It's a Feature! (BFS)
1543 Pefect Cubes Accepted
1562 Oil Deposits Accepted 2006-08-14 04:39 Floodfill
1564 Sum It Up Accepted
1573 Robot Motion
1579 Fuction Run Fun
1601 Pizza Anyone?
1606 Jugs Accepted
1632 Vase collection
1639 Picnic Planing
1655 Balancing Act
1659 Frog's Neighborhood
1664 放苹果 整数无序拆分
1680 Frok() Makes Trouble
1683 Puzzlestan
1691 Painting A Board
1708 Game
1709 Cross word
1713 Divide et unita
1714 The Cave
1731 orders 任意字符串的全排列
1742 Coins 更像是DP
1745 Divisibility Accepted shouldn't be counted as a searching prob
1746 Loan
1753 Flip Game (BFS) Accepted
1771 Elevator Stopping Plan
1775 Sum of Factorials Accepted
1826 The best Farm
1831 不定方程组
1847 Tram Accepted 2006-08-10 02:35 Dijkstra
1855 Mint
1856 Sea Battle
1873 The Fortified Forest 回溯
1878 Jill's Bike
1882 Stamps
1890 Switching Channels
1903 Jurassic Remains
1915 Knight Moves (BFS) 双向广度优先搜索提高效率
1924 The Treasure
1935 Journey
1948 Trianglar Pastures
1950 Dessert 
1966 Cable TV Network
1979 Red and Black Accepted 2006-08-05 17:04
1980 Unit Fraction Partition 剪枝
2038 Team Ranking Accepted 2006-08-11 19:12无聊题，全排列加四层循环=0ms
2046 Gap
2049 Finding Nemo
2078 Matrix
2083 Fractal
2157 Maze
2170 Lattice Animals
2182 LOst cows Accepted 2006 08-13 17:02 segment tree
2184 Cow Exibition
2197 Jill's Tour Paths
2225 Asteriods! Accepted
2251 Dungeon Master Accepted 2006-08-21 02:39三维迷宫BFS，简单
2288 Islands and Bridges
2243 Knight Moves (BFS) Accepted
2312 Battle City (BFS) Accepted 2006-08-16 01:13一个int型数组定义为char而痛苦WA了半天。
2331 Water Pipe
2339 Rock, Scissors, Paper
2340 Memory management
2349 Aratic Network
2362 Square Accepted 2006-08-02
2378 Tree Cutting
2386 Lake Counting Accepted 2006-08-14 04:50 Floodfill
2415 Hike on a Gragh Accepted 2006-08-21 01:51普通BFS
2488 A Knight's Journey
2547 No Tipping Accepted 2006-08-21 18:55 DFS+DP状态压缩
2676 Sudoku
2908 Quantum Accepted 2006-09-09 20:10 BFS+优先队列
3620 Avoid The Lakes BFS floodfill