Codeforces Round 774 (Div. 2)
B
Quality vs Quantity
Codeforces
800
原题
← AC →
翻译中…

$ \def\myred#1{\color{red}{\underline{\bf{#1}}}} \def\myblue#1{\color{blue}{\overline{\bf{#1}}}} $ $\def\RED{\myred{Red}} \def\BLUE{\myblue{Blue}}$

翻译中…

You are given a sequence of $n$ non-negative integers $a_1, a_2, \ldots, a_n$. Initially, all the elements of the sequence are unpainted. You can paint each number $\RED$ or $\BLUE$ (but not both), or leave it unpainted.

翻译中…

For a color $c$, $\text{Count}(c)$ is the number of elements in the sequence painted with that color and $\text{Sum}(c)$ is the sum of the elements in the sequence painted with that color.

翻译中…

For example, if the given sequence is $[2, 8, 6, 3, 1]$ and it is painted this way: $[\myblue{2}, 8, \myred{6}, \myblue{3}, 1]$ (where $6$ is painted red, $2$ and $3$ are painted blue, $1$ and $8$ are unpainted) then $\text{Sum}(\RED)=6$, $\text{Sum}(\BLUE)=2+3=5$, $\text{Count}(\RED)=1$, and $\text{Count}(\BLUE)=2$.

翻译中…

Determine if it is possible to paint the sequence so that $\text{Sum}(\RED) \gt \text{Sum}(\BLUE)$ and $\text{Count}(\RED) \lt \text{Count}(\BLUE)$.

翻译中…

Input

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Each test contains multiple test cases. The first line contains the number of test cases $t$ ($1 \le t \le 1000$). Description of the test cases follows.

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The first line of each test case contains an integer $n$ ($3\le n\le 2\cdot 10^5$) — the length of the given sequence.

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The second line of each test case contains $n$ integers $a_1,a_2,\ldots,a_n$ ($0\le a_i\le 10^9$) — the given sequence.

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It is guaranteed that the sum of $n$ over all test cases does not exceed $2\cdot 10^5$.

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Output

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For each test case, print YES if it is possible to paint the given sequence satisfying the above requirements, and NO otherwise.

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You can output YES and NO in any case (for example, strings yEs, yes, Yes and YES will be recognized as a positive response).

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Note

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In the first test case, there is no possible way to paint the sequence. For example, if you paint the sequence this way: $[\myblue{1},\myblue{2},\myred{3}]$ (where $3$ is painted red, $1$ and $2$ are painted blue) then $\text{Count}(\RED)=1 \lt \text{Count}(\BLUE)=2$, but $\text{Sum}(\RED)=3 \ngtr \text{Sum}(\BLUE)=3$. So, this is not a possible way to paint the sequence.

翻译中…

In the second test case, a possible way to paint the sequence is described in the statement. We can see that $\text{Sum}(\RED)=6 \gt \text{Sum}(\BLUE)=5$ and $\text{Count}(\RED)=1 \lt \text{Count}(\BLUE)=2$.

翻译中…

In the third test case, there is no possible way to paint the sequence. For example, if you paint the sequence this way: $[\myred{3},\myred{5},\myblue{4}, \myblue{2}]$ (where $3$ and $5$ are painted red, $4$ and $2$ are painted blue) then $\text{Sum}(\RED) = 8 \gt \text{Sum}(\BLUE) = 6$ but $\text{Count}(\RED) = 2 \nless \text{Count}(\BLUE) = 2$. So, this is not a possible way to paint the sequence.

翻译中…

In the fourth test case, it can be proven that there is no possible way to paint the sequence satisfying sum and count constraints.

翻译中…

样例

Input #1
4
3
1 2 3
5
2 8 6 3 1
4
3 5 4 2
5
1000000000 1000000000 1000000000 1000000000 1000000000
Output #1
NO
YES
NO
NO
InputCopy OutputCopy
题目信息
题号
1646B
时间限制
2 s
内存限制
256 MB
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双指针

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