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package org.study;
public class Dijkstra {
public static void main(String[] args) {
// TODO Auto-generated method stub
}
}
class Graph {
// 노드개수
private int n;
// 노드간의 가중치 저장 변수
private int maps[][];
public Graph(int n) {
this.n = n;
maps = new int[n + 1][n + 1];
}
// 간선 정보
public void input(int i, int j, int w) {
maps[i][j] = w;
maps[j][i] = w;
}
public void dijkstra(int v) {
// 최단 거리 저장할 변수
int distance[] = new int[n + 1];
// 노드 방문했는지 확인
boolean[] check = new boolean[n + 1];
// dinstance값 초기화
for (int i = 1; i < n + 1; i++) {
distance[i] = Integer.MAX_VALUE;
}
// 시작노드값 초기화
distance[v] = 0;
check[v] = true;
// 연결노드 dinstance갱신
// 방문 하지 않았고, 자기 자신이 아니면 거리 갱신
for (int i = 1; i < n + 1; i++) {
if (check[i] == false && maps[v][i] != 0) {
distance[i] = maps[v][i];
}
}
for (int a = 0; a < n - 1; a++) {
int min = Integer.MAX_VALUE;
int min_index = -1;
// 최소값 찾기
for(int i=1; i<n+1; i++) {
if(!check[i] && distance[i] != Integer.MAX_VALUE) {
if(distance[i]<min) {
min = distance[i];
min_index = 1;
}
}
}
check[min_index] = true;
for(int i=1; i<n+1; i++) {
if(!check[i] && maps[min_index][i]!=0){
if(distance[i]>distance[min_index]+maps[min_index][i]){
distance[i] = distance[min_index]+maps[min_index][i];
}
}
}
//결과값 출력
for(int i=1;i<n+1;i++){
System.out.print(distance[i]+" ");
}
System.out.println("");
}
}
}
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