hello-algo/zh-hant/codes/go/chapter_graph/graph_adjacency_matrix.go

103 lines
2.6 KiB
Go
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

// File: graph_adjacency_matrix.go
// Created Time: 2023-01-31
// Author: Reanon (793584285@qq.com)
package chapter_graph
import "fmt"
/* 基於鄰接矩陣實現的無向圖類別 */
type graphAdjMat struct {
// 頂點串列,元素代表“頂點值”,索引代表“頂點索引”
vertices []int
// 鄰接矩陣,行列索引對應“頂點索引”
adjMat [][]int
}
/* 建構子 */
func newGraphAdjMat(vertices []int, edges [][]int) *graphAdjMat {
// 新增頂點
n := len(vertices)
adjMat := make([][]int, n)
for i := range adjMat {
adjMat[i] = make([]int, n)
}
// 初始化圖
g := &graphAdjMat{
vertices: vertices,
adjMat: adjMat,
}
// 新增邊
// 請注意edges 元素代表頂點索引,即對應 vertices 元素索引
for i := range edges {
g.addEdge(edges[i][0], edges[i][1])
}
return g
}
/* 獲取頂點數量 */
func (g *graphAdjMat) size() int {
return len(g.vertices)
}
/* 新增頂點 */
func (g *graphAdjMat) addVertex(val int) {
n := g.size()
// 向頂點串列中新增新頂點的值
g.vertices = append(g.vertices, val)
// 在鄰接矩陣中新增一行
newRow := make([]int, n)
g.adjMat = append(g.adjMat, newRow)
// 在鄰接矩陣中新增一列
for i := range g.adjMat {
g.adjMat[i] = append(g.adjMat[i], 0)
}
}
/* 刪除頂點 */
func (g *graphAdjMat) removeVertex(index int) {
if index >= g.size() {
return
}
// 在頂點串列中移除索引 index 的頂點
g.vertices = append(g.vertices[:index], g.vertices[index+1:]...)
// 在鄰接矩陣中刪除索引 index 的行
g.adjMat = append(g.adjMat[:index], g.adjMat[index+1:]...)
// 在鄰接矩陣中刪除索引 index 的列
for i := range g.adjMat {
g.adjMat[i] = append(g.adjMat[i][:index], g.adjMat[i][index+1:]...)
}
}
/* 新增邊 */
// 參數 i, j 對應 vertices 元素索引
func (g *graphAdjMat) addEdge(i, j int) {
// 索引越界與相等處理
if i < 0 || j < 0 || i >= g.size() || j >= g.size() || i == j {
fmt.Errorf("%s", "Index Out Of Bounds Exception")
}
// 在無向圖中,鄰接矩陣關於主對角線對稱,即滿足 (i, j) == (j, i)
g.adjMat[i][j] = 1
g.adjMat[j][i] = 1
}
/* 刪除邊 */
// 參數 i, j 對應 vertices 元素索引
func (g *graphAdjMat) removeEdge(i, j int) {
// 索引越界與相等處理
if i < 0 || j < 0 || i >= g.size() || j >= g.size() || i == j {
fmt.Errorf("%s", "Index Out Of Bounds Exception")
}
g.adjMat[i][j] = 0
g.adjMat[j][i] = 0
}
/* 列印鄰接矩陣 */
func (g *graphAdjMat) print() {
fmt.Printf("\t頂點串列 = %v\n", g.vertices)
fmt.Printf("\t鄰接矩陣 = \n")
for i := range g.adjMat {
fmt.Printf("\t\t\t%v\n", g.adjMat[i])
}
}