第一期训练题02

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#include "pch.h"
#include <iostream>
using namespace std;
int main()
{
	int n;
	cin >> n;
	int *p1 = new int[n];
	int *p2 = new int[n];
	for (int i = 0; i < n; i++)
	{
		cin >> p1[i] >> p2[i];
	}
	int a = 0;
	for (int i = 0; i < n; i++)
	{
		if (p2[i] - p1[i] >= 2)
			a++;
	}
	cout << a;
	delete p1;
	delete p2;
	return 0;
}