|
|
"""
|
|
|
File: graph_adjacency_matrix.py
|
|
|
Created Time: 2023-02-23
|
|
|
Author: krahets (krahets@163.com)
|
|
|
"""
|
|
|
|
|
|
import sys
|
|
|
from pathlib import Path
|
|
|
|
|
|
sys.path.append(str(Path(__file__).parent.parent))
|
|
|
from modules import Vertex, print_matrix
|
|
|
|
|
|
|
|
|
class GraphAdjMat:
|
|
|
"""基於鄰接矩陣實現的無向圖類別"""
|
|
|
|
|
|
def __init__(self, vertices: list[int], edges: list[list[int]]):
|
|
|
"""建構子"""
|
|
|
# 頂點串列,元素代表“頂點值”,索引代表“頂點索引”
|
|
|
self.vertices: list[int] = []
|
|
|
# 鄰接矩陣,行列索引對應“頂點索引”
|
|
|
self.adj_mat: list[list[int]] = []
|
|
|
# 新增頂點
|
|
|
for val in vertices:
|
|
|
self.add_vertex(val)
|
|
|
# 新增邊
|
|
|
# 請注意,edges 元素代表頂點索引,即對應 vertices 元素索引
|
|
|
for e in edges:
|
|
|
self.add_edge(e[0], e[1])
|
|
|
|
|
|
def size(self) -> int:
|
|
|
"""獲取頂點數量"""
|
|
|
return len(self.vertices)
|
|
|
|
|
|
def add_vertex(self, val: int):
|
|
|
"""新增頂點"""
|
|
|
n = self.size()
|
|
|
# 向頂點串列中新增新頂點的值
|
|
|
self.vertices.append(val)
|
|
|
# 在鄰接矩陣中新增一行
|
|
|
new_row = [0] * n
|
|
|
self.adj_mat.append(new_row)
|
|
|
# 在鄰接矩陣中新增一列
|
|
|
for row in self.adj_mat:
|
|
|
row.append(0)
|
|
|
|
|
|
def remove_vertex(self, index: int):
|
|
|
"""刪除頂點"""
|
|
|
if index >= self.size():
|
|
|
raise IndexError()
|
|
|
# 在頂點串列中移除索引 index 的頂點
|
|
|
self.vertices.pop(index)
|
|
|
# 在鄰接矩陣中刪除索引 index 的行
|
|
|
self.adj_mat.pop(index)
|
|
|
# 在鄰接矩陣中刪除索引 index 的列
|
|
|
for row in self.adj_mat:
|
|
|
row.pop(index)
|
|
|
|
|
|
def add_edge(self, i: int, j: int):
|
|
|
"""新增邊"""
|
|
|
# 參數 i, j 對應 vertices 元素索引
|
|
|
# 索引越界與相等處理
|
|
|
if i < 0 or j < 0 or i >= self.size() or j >= self.size() or i == j:
|
|
|
raise IndexError()
|
|
|
# 在無向圖中,鄰接矩陣關於主對角線對稱,即滿足 (i, j) == (j, i)
|
|
|
self.adj_mat[i][j] = 1
|
|
|
self.adj_mat[j][i] = 1
|
|
|
|
|
|
def remove_edge(self, i: int, j: int):
|
|
|
"""刪除邊"""
|
|
|
# 參數 i, j 對應 vertices 元素索引
|
|
|
# 索引越界與相等處理
|
|
|
if i < 0 or j < 0 or i >= self.size() or j >= self.size() or i == j:
|
|
|
raise IndexError()
|
|
|
self.adj_mat[i][j] = 0
|
|
|
self.adj_mat[j][i] = 0
|
|
|
|
|
|
def print(self):
|
|
|
"""列印鄰接矩陣"""
|
|
|
print("頂點串列 =", self.vertices)
|
|
|
print("鄰接矩陣 =")
|
|
|
print_matrix(self.adj_mat)
|
|
|
|
|
|
|
|
|
"""Driver Code"""
|
|
|
if __name__ == "__main__":
|
|
|
# 初始化無向圖
|
|
|
# 請注意,edges 元素代表頂點索引,即對應 vertices 元素索引
|
|
|
vertices = [1, 3, 2, 5, 4]
|
|
|
edges = [[0, 1], [0, 3], [1, 2], [2, 3], [2, 4], [3, 4]]
|
|
|
graph = GraphAdjMat(vertices, edges)
|
|
|
print("\n初始化後,圖為")
|
|
|
graph.print()
|
|
|
|
|
|
# 新增邊
|
|
|
# 頂點 1, 2 的索引分別為 0, 2
|
|
|
graph.add_edge(0, 2)
|
|
|
print("\n新增邊 1-2 後,圖為")
|
|
|
graph.print()
|
|
|
|
|
|
# 刪除邊
|
|
|
# 頂點 1, 3 的索引分別為 0, 1
|
|
|
graph.remove_edge(0, 1)
|
|
|
print("\n刪除邊 1-3 後,圖為")
|
|
|
graph.print()
|
|
|
|
|
|
# 新增頂點
|
|
|
graph.add_vertex(6)
|
|
|
print("\n新增頂點 6 後,圖為")
|
|
|
graph.print()
|
|
|
|
|
|
# 刪除頂點
|
|
|
# 頂點 3 的索引為 1
|
|
|
graph.remove_vertex(1)
|
|
|
print("\n刪除頂點 3 後,圖為")
|
|
|
graph.print()
|