CF1629B.GCD Arrays
入门
通过率:0%
时间限制:2.00s
内存限制:256MB
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题目描述
Consider the array a composed of all the integers in the range [l,r]. For example, if l=3 and r=7, then a=[3,4,5,6,7].
Given l, r, and k, is it possible for gcd(a) to be greater than 1 after doing the following operation at most k times?
- Choose 2 numbers from a.
- Permanently remove one occurrence of each of them from the array.
- Insert their product back into a.
gcd(b) denotes the greatest common divisor (GCD) of the integers in b.
考虑由区间 [l,r] 内所有整数构成的数组 a。例如,若 l=3 且 r=7,则 a=[3,4,5,6,7]。
给定 l、r 和 k,在最多执行以下操作 k 次后,是否可能使 gcd(a)>1?
- 从 a 中选择 2 个数;
- 永久地从数组中各移除其中一个数的一次出现;
- 将这两个数的乘积重新插入 a 中。
gcd(b) 表示数组 b 中所有整数的最大公约数(GCD)。
输入格式
The first line of the input contains a single integer t (1≤t≤105) — the number of test cases. The description of test cases follows.
The input for each test case consists of a single line containing 3 non-negative integers l, r, and k (1≤l≤r≤109,0≤k≤r−l).
输入的第一行包含一个整数 t(1≤t≤105),表示测试用例的数量。随后是各测试用例的描述。
每个测试用例的输入为一行,包含三个非负整数 l、r 和 k(1≤l≤r≤109,0≤k≤r−l)。
输出格式
For each test case, print "YES" if it is possible to have the GCD of the corresponding array greater than 1 by performing at most k operations, and "NO" otherwise (case insensitive).
对于每个测试用例,如果可以通过执行至多 k 次操作使得对应数组的最大公约数(GCD)大于 1,则输出 "YES";否则输出 "NO"(不区分大小写)。
输入输出样例
输入#1
9 1 1 0 3 5 1 13 13 0 4 4 0 3 7 4 4 10 3 2 4 0 1 7 3 1 5 3
输出#1
NO NO YES YES YES YES NO NO YES
说明/提示
For the first test case, a=[1], so the answer is "NO", since the only element in the array is 1.
For the second test case the array is a=[3,4,5] and we have 1 operation. After the first operation the array can change to: [3,20], [4,15] or [5,12] all of which having their greatest common divisor equal to 1 so the answer is "NO".
For the third test case, a=[13], so the answer is "YES", since the only element in the array is 13.
For the fourth test case, a=[4], so the answer is "YES", since the only element in the array is 4.
对于第一个测试用例,a=[1],因此答案为“NO”,因为数组中唯一的元素是 1。
对于第二个测试用例,数组为 a=[3,4,5],且我们有 1 次操作。第一次操作后,数组可变为:[3,20]、[4,15] 或 [5,12],这些数组的最大公约数均为 1,因此答案为“NO”。
对于第三个测试用例,a=[13],因此答案为“YES”,因为数组中唯一的元素是 13。
对于第四个测试用例,a=[4],因此答案为“YES”,因为数组中唯一的元素是 4。
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