Algorithm
George has recently entered the BSUCP (Berland State University for Cool Programmers). George has a friend Alex who has also entered the university. Now they are moving into a dormitory.
George and Alex want to live in the same room. The dormitory has n rooms in total. At the moment the i-th room has pi people living in it and the room can accommodate qi people in total (pi ≤ qi). Your task is to count how many rooms has free place for both George and Alex.
The first line contains a single integer n (1 ≤ n ≤ 100) — the number of rooms.
The i-th of the next n lines contains two integers pi and qi (0 ≤ pi ≤ qi ≤ 100) — the number of people who already live in the i-th room and the room's capacity.
Print a single integer — the number of rooms where George and Alex can move in.
3
1 1
2 2
3 3
0
3
1 10
0 10
10 10
2
Code Examples
#1 Code Example with C++ Programming
Code -
C++ Programming
#include<iostream>
using namespace std;
int main(){
int n, p, q, count = 0;
cin>>n;
for(int i = 0; i < n; i++){
cin>>p;
cin>>q;
if(q - p <= 2){
count++;
}
}
cout<<count;
return 0;
}Input
1 1
2 2
3 3
Demonstration
Codeforcess Solution 467-A A. George and Accommodation ,C++, Java, Js and Python ,467-A,Codeforcess Solution