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

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// 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])
}
}