백준 1946

package baekjoon.그리디;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main1946 {

   static int N;
   static int[] rank;

   static void go() {
      int ans = 1;
      int min = rank[1];
      for (int i = 2; i <= N; i++) {
         if (rank[i] < min) {
            ans++;
            min = rank[i];
         }
      }
      System.out.println(ans);
   }

   public static void main(String[] args) throws Exception {
      BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
      int T = Integer.parseInt(br.readLine());
      StringTokenizer st;
      while (T-- > 0) {
         N = Integer.parseInt(br.readLine());
         rank = new int[N + 1];
         for (int i = 0; i < N; i++) {
            st = new StringTokenizer(br.readLine());
            int x = Integer.parseInt(st.nextToken());
            rank[x] = Integer.parseInt(st.nextToken());
         }
         go();
      }
   }

}