package Sevenbridge;
import java.util.ArrayList;
import java.util.Scanner;
public class SevenBridgeProblem {
public static int MAX = 1000;
public static int[][] map = new int[MAX][MAX]; //输入图
public static ArrayList<Integer> result = new ArrayList<Integer>(); //用于存放最终输出结果
//判断给定图的每个顶点的度是否均为偶数
public boolean judge(int[] degree) {
for(int i = 0;i < degree.length;i++) {
if(degree[i] % 2 != 0)
return false;
}
return true;
}
//使用BFS遍历,判断给定图是否为连通图
public boolean bfs(int n) {
boolean[] used = new boolean[n];
ArrayList<Integer> list = new ArrayList<Integer>();
list.add(0);
used[0] = true;
while(!list.isEmpty()) {
int temp = list.get(0);
list.remove(0);
for(int i = 0;i < n;i++) {
if(!used[i] && map[temp][i] != 0) {
used[i] = true;
list.add(i);
}
}
}
for(int i = 0;i < n;i++) {
if(used[i] == false)
return false;
}
return true;
}
public static void main(String[] args) {
SevenBridgeProblem test = new SevenBridgeProblem();
Scanner in = new Scanner(System.in);
while(true) {
int n = in.nextInt(); //输入图的顶点数
if(n == 0)
break;
int m = in.nextInt(); //输入图的边数目
int[] degree = new int[n]; //用于计算输入图的每个顶点的度
for(int i = 0;i < m;i++) {
int a = in.nextInt();
int b = in.nextInt();
map[a - 1][b - 1] = 1;
map[b - 1][a - 1] = 1;
degree[a - 1]++;
degree[b - 1]++;
}
if(test.judge(degree) && test.bfs(n))
result.add(1);
else
result.add(0);
}
for(int i = 0;i < result.size();i++)
System.out.println(result.get(i));
}
}
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转载自blog.csdn.net/weixin_43997477/article/details/103557182
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