16267번 - A Bit Palindromic Numbers 출처다국어

Let us call the integer number a bit palindromic, if its first digit is the same as its last digit. We use decimal notation without leading zeroes. Your task is to count how many a bit palindromic numbers are there between l and r, inclusive.

The following numbers are a bit palindromic in the first sample test: 8, 9, 11, and 22.

The numbers in the second sample test — 1251 and 1261.

Input data contains multiple test cases. The first line contains one integer t — the number of test cases (1 ≤ t ≤ 5·10⁴).

Each test case is described by a single line that contains two integers: l and r (1 ≤ l ≤ r ≤ 10¹⁸).

For each test case output one integer: how many a bit palindromic numbers are there in the given range.