A14574 | $Moderate Modular Mode$

时间限制1s

内存限制256MB

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题目描述

YouKn0wWho has two even integers $x$ and $y$ . Help him to find an integer $n$ such that $1 \le n \le 2 \cdot 10^{18}$ and $n \bmod x = y \bmod n$ . Here, $a \bmod b$ denotes the remainder of $a$ after division by $b$ . If there are multiple such integers, output any. It can be shown that such an integer always exists under the given constraints.

The first line contains a single integer $t$ ( $1 \le t \le 10^5$ ) — the number of test cases. The first and only line of each test case contains two integers $x$ and $y$ ( $2 \le x, y \le 10^9$ , both are even).

For each test case, print a single integer $n$ ( $1 \le n \le 2 \cdot 10^{18}$ ) that satisfies the condition mentioned in the statement. If there are multiple such integers, output any. It can be shown that such an integer always exists under the given constraints.

输入 #1

4
4 8
4 2
420 420
69420 42068

输出 #1

C++ 编辑器

输入

输出