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Scanner sc = new Scanner(System.in);
int t = sc.nextInt();
for(int i=0;i<t;i++)
{
int a = sc.nextInt();
int b = sc.nextInt();
System.out.println((int)(Math.floor(Math.sqrt(b))-Math.ceil(Math.sqrt(a))+1));
}
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Sherlock and Squares
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JAVA O(1)