45 lines
1.1 KiB
Java
45 lines
1.1 KiB
Java
package com.thinker.bishi.xiaomi;
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import java.util.Scanner;
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/**
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* @author lzh
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*/
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public class ShuGao {
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public static void main(String[] args) {
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Scanner in = new Scanner(System.in);
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int len = Integer.parseInt(in.nextLine());
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int[][] arr = new int[len][len];
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for(int i=0;i<len;i++){
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for(int j=0;j<len;j++){
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arr[i][j] = 0;
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}
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}
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arr[0][0] = 1;
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int k=1;
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while (k<len){
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String[] tmp = in.nextLine().split(" ");
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int i = Integer.parseInt(tmp[0])+1;
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int j = Integer.parseInt(tmp[1]);
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arr[i][j] = 1;
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k++;
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}
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k = 0;
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for(int i=0;i<len;i++){
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int count = 0;
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for(int j=0;j<len;j++){
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if(arr[i][j] == 1){
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k++;
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break;
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}else {
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count ++;
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}
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}
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if(count == len){
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break;
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}
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}
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System.out.println(k);
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}
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}
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