哪里错了

#include<bits/stdc++.h>
using namespace std;
int f(int a,int b)
{
	if ((a>=90 and a<=140) and (b>=60 and b<=90))
	    return true;
	else return false;
}
int main(){
	int n;
	cin >> n;
	int a,b,sum=0,num=0;
	for (int i=1;i<=n;i++)
	{
		cin >> a >> b;
		if (num>sum)
		    sum=0;
		if (f(a,b)==1)
		    sum++;
		else
		{
			num=sum;
			sum=0;
		}
	}
	cout << sum;
}

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