It is sufficient to count the number of indices \(i\) with \(A_i < B_i\). This can be done by using a for statement to check if \(A_i < B_i\) for each \(i\).

Sample code

#include <bits/stdc++.h> using namespace std; int main() {	int n;	cin >> n;	int ans = 0;	for (int i = 0; i < n; i++) {	int a, b;	cin >> a >> b;	if (a < b) ans++;	}	cout << ans << '\n'; }