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  1. import java.util.*;
  2. import java.io.*;
  3. //Solution Credits: Taranpreet Singh
  4. class Editorial{
  5.     //SOLUTION BEGIN
  6.     void solve(int TC) throws Exception{
  7.         int n = ni(), ans = 0;
  8.         for(int i = 1; i<= n; i++){
  9.             int start = ni(), end = ni();
  10.             //If Expected ending time < actual end time, submission is judged late.
  11.             if(start+5<end)ans++;
  12.         }
  13.         pn(ans);
  14.     }
  15.     //SOLUTION ENDS
  16.     boolean multipleTC = true;
  17.     FastReader in;PrintWriter out;
  18.     void run() throws Exception{
  19.         in = new FastReader();
  20.         out = new PrintWriter(System.out);
  21.         for(int i = 1, T = (multipleTC)?ni():1; i<= T; i++)solve(i);
  22.         out.flush();
  23.         out.close();
  24.     }
  25.     public static void main(String[] args) throws Exception{
  26.         new Editorial().run();
  27.     }
  28.     void p(Object o){out.print(o);}
  29.     void pn(Object o){out.println(o);}
  30.     void pni(Object o){out.println(o);out.flush();}
  31.     String n(){return in.next();}
  32.     String nln(){return in.nextLine();}
  33.     int ni(){return Integer.parseInt(in.next());}
  34.     long nl(){return Long.parseLong(in.next());}
  35.     double nd(){return Double.parseDouble(in.next());}
  36.     class FastReader{
  37.         BufferedReader br;
  38.         StringTokenizer st;
  39.         public FastReader(){
  40.             br = new BufferedReader(new InputStreamReader(System.in));
  41.         }
  42.  
  43.         public FastReader(String s) throws Exception{
  44.             br = new BufferedReader(new FileReader(s));
  45.         }
  46.  
  47.         String next(){
  48.             while (st == null || !st.hasMoreElements()){
  49.                 try{
  50.                     st = new StringTokenizer(br.readLine());
  51.                 }catch (IOException  e){
  52.                     e.printStackTrace();
  53.                 }
  54.             }
  55.             return st.nextToken();
  56.         }
  57.  
  58.         String nextLine(){
  59.             String str = "";
  60.             try{    
  61.                 str = br.readLine();
  62.             }catch (IOException e){
  63.                 e.printStackTrace();
  64.             }   
  65.             return str;
  66.         }
  67.     }
  68. }
Success #stdin #stdout 0.04s 2184192KB
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https://ideone.com/TaRBby
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
secret

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