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图-地图软件怎么存下千万条路?

图-地图软件怎么存下千万条路?

图-地图软件怎么存下千万条路?

数据结构与算法 · 图 · 第 02 篇

标签:#图 #邻接矩阵 #邻接表 #图的表示

预计阅读时间:12分钟


开篇-1万个城市,1亿条路

高德地图上存着全国所有城市和道路。城市数以万计,道路数以亿计。这些数据存在计算机里,不是画在纸上——计算机需要一种高效的方式来存储和访问图。

有两种主流方法:邻接矩阵邻接表。它们就像同一份地图的两种画法,各有各的适用场景。今天我们就来聊聊这两种表示方法,搞清楚什么时候用哪种。


邻接矩阵:二维表格存图

邻接矩阵用一个 n×n 的二维数组表示图。matrix[i][j] = 1 表示顶点 i 和顶点 j 之间有边。用代码表示:

# 4个顶点A,B,C,Dn = 4matrix = [    [0110],  # A    [1001],  # B    [1001],  # C    [0110]   # D]# 检查A和B是否连通if matrix[0][1] == 1:print("A和B连通")

带权图的邻接矩阵,把1换成权重:

matrix = [    [0230],   # A到B代价2,A到C代价3    [2001],   # B到A代价2,B到D代价1    [3004],   # C到A代价3,C到D代价4    [0140]    # D到B代价1,D到C代价4]

邻接矩阵的优势:

  • 查两点是否连通:O(1),直接查表格
  • 代码简单:二维数组,一看就懂

劣势:

  • 空间浪费:n个顶点需要n²空间。1万个城市就要1亿个格子。如果城市之间大部分不相连(稀疏图),绝大部分格子存的是0
  • 遍历某个顶点的所有邻居:O(n),需要扫一整行

什么时候用邻接矩阵?顶点少、边密集(稠密图)的时候。


邻接表:链表存图

邻接表给每个顶点维护一个链表,只存它直接相连的邻居。

用代码表示:

graph = {'A': ['B''C'],'B': ['A''D'],'C': ['A''D'],'D': ['B''C']}# 带权版本graph_weighted = {'A': [('B'2), ('C'3)],'B': [('A'2), ('D'1)],'C': [('A'3), ('D'4)],'D': [('B'1), ('C'4)]}

邻接表的优势:

  • 省空间:只存实际存在的边,空间O(n + m),n是顶点数,m是边数
  • 遍历邻居快:O(邻居数),不需要扫一整行

劣势:

  • 查两点是否连通:需要遍历链表,O(邻居数)
  • 代码稍微复杂:需要处理链表/列表

什么时候用邻接表?顶点多、边少(稀疏图)的时候。


对比:地图软件选哪种

高德地图有上万个POI(兴趣点),但每个POI只和附近的几十个POI直接相连。这是一个典型的稀疏图——边数远小于n²。

如果用邻接矩阵:1万×1万 = 1亿个格子,每个格子4字节 = 400MB内存,绝大部分是0。

如果用邻接表:1万个顶点 + 几十万条边,总共几MB内存。

结论:地图软件用邻接表。 事实上,几乎所有工程应用都用邻接表,因为真实世界的图基本都是稀疏的。

邻接矩阵主要用于两种情况:

  1. 图很小(n < 100),代码简单优先
  2. 需要频繁查询"任意两点是否连通"(Floyd算法)

LeetCode 实战:找到所有路径(LeetCode 797)

题目:给你一个有向无环图,graph[i]是顶点i的所有邻居。找出从顶点0到顶点n-1的所有路径。

最直观的想法:从0出发,DFS走到每个邻居,记录路径,到达n-1时把路径加入结果。

defall_paths_source_target(graph):    n = len(graph)    result = []    path = [0]  # 从顶点0开始defdfs(node):# 到达终点?保存路径if node == n - 1:            result.append(path.copy())return# 遍历所有邻居for neighbor in graph[node]:            path.append(neighbor)            dfs(neighbor)            path.pop()  # 回溯    dfs(0)return result

这道题和图的表示的联系:题目给的graph就是邻接表格式,直接遍历graph[node]就能拿到所有邻居。如果用邻接矩阵,需要先扫一整行找邻居,效率低得多。

复杂度:时间O(2^n),最坏情况路径数 exponentially 增长。空间O(n),递归栈深度。

这里有几个坑

  1. path要用copyresult.append(path)存的是引用,path后续会变。result.append(path.copy())存的是快照。

  2. 回溯别忘了pop。进入邻居前append,递归返回后pop,否则路径会越积越长。

  3. 题目是无环图。如果有环,需要额外标记访问过的节点防止无限循环。

生活里的影子:旅行规划——从出发地到目的地,把所有可能的路线列出来。每到一个城市,看看下一站能去哪,走到终点就记录一条路线。


总结

维度
邻接矩阵
邻接表
空间复杂度
O(n²)
O(n + m)
查两点连通
O(1)
O(邻居数)
遍历邻居
O(n)
O(邻居数)
适用场景
稠密图、小图
稀疏图、大图
工程选择
极少用
几乎都用

金句:邻接矩阵像一张完整的表格——行列整齐,但大部分格子空着浪费。邻接表像每个人的通讯录——只存认识的人,不存全世界的人。真实世界的图大都是稀疏的,邻接表才是工程界的默认选择。


觉得有收获?转发给你的技术伙伴

你平时写代码时,如果遇到一个图的问题,你会先想用邻接矩阵还是邻接表?如果图里有100万个节点但只有200万条边,选哪种更省内存?评论区聊聊你的选择。

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  1. CONNECT:[ UseTime:0.000849s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001447s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000722s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000671s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001310s ]
  6. SELECT * FROM `set` [ RunTime:0.000593s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001482s ]
  8. SELECT * FROM `article` WHERE `id` = 889951 LIMIT 1 [ RunTime:0.001045s ]
  9. UPDATE `article` SET `lasttime` = 1786204984 WHERE `id` = 889951 [ RunTime:0.001829s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000574s ]
  11. SELECT * FROM `article` WHERE `id` < 889951 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001143s ]
  12. SELECT * FROM `article` WHERE `id` > 889951 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001068s ]
  13. SELECT * FROM `article` WHERE `id` < 889951 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001670s ]
  14. SELECT * FROM `article` WHERE `id` < 889951 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001743s ]
  15. SELECT * FROM `article` WHERE `id` < 889951 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001782s ]
0.217991s