华为OD机试之报文回路（Java源码）

题目描述

输入描述

输出描述

用例

具体·解析看代码

package com.bytesoc.calc;

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class T70 {
	static class Route {
		int start;
		int end;
		boolean startToEnd;
		boolean endToStart;

		public boolean equals(Route obj) {
			return (obj.start == this.start && obj.end == this.end) || (obj.start == this.end && obj.end == this.start);
		}
	}

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int line = Integer.parseInt(sc.nextLine());
		List<Route> routes = new ArrayList<>();
		for (int i = 0; i < line; i++) {
			Route route = new Route();
			String str = sc.nextLine();
			route.start = Integer.parseInt(str.split(" ")[0]);
			route.end = Integer.parseInt(str.split(" ")[1]);
			Route objRoute = findRoute(routes, route);
			if (objRoute == null) {
				route.startToEnd = true;
				routes.add(route);
			} else {
				System.out.println(objRoute.end + "-" + route.start);
				if (objRoute.end == route.start) {
					objRoute.endToStart = true;
				}
			}
		}
		for (Route r : routes) {
			if (r.startToEnd == false || r.endToStart == false) {
				System.out.println("FALSE");
				System.exit(0);
			}
		}
		System.out.println("TRUE");
	}

	public static Route findRoute(List<Route> routes, Route route) {
		for (Route r : routes) {
			if (r.equals(route)) {
				return r;
			}
		}
		return null;
	}
}

执行结果：