benchmarks.wiki / Public workspace

OlympiadBench / 2336 / Kerry has a list of n integers a₁,a₂,…,a_(n) satisfying …

Problem

Answer published by the source. Consult the official source to check your work against its answer.

question

Kerry has a list of nn integers a1,a2,,ana_{1}, a_{2}, \ldots, a_{n} satisfying a1a2ana_{1} \leq a_{2} \leq \ldots \leq a_{n}. Kerry calculates the pairwise sums of all m=12n(n1)m=\frac{1}{2} n(n-1) possible pairs of integers in her list and orders these pairwise sums as s1s2sms_{1} \leq s_{2} \leq \ldots \leq s_{m}. For example, if Kerry's list consists of the three integers 1,2,41,2,4, the three pairwise sums are 3,5,63,5,6. Suppose that n=4n=4 and that the 6 pairwise sums are s1=8,s2=104,s3=106s_{1}=8, s_{2}=104, s_{3}=106, s4=110,s5=112s_{4}=110, s_{5}=112, and s6=208s_{6}=208. Determine two possible lists (a1,a2,a3,a4)(a_{1}, a_{2}, a_{3}, a_{4}) that Kerry could have.
Plain-text mathematical notation (without MathML)
Kerry has a list of n integers a₁,a₂,…,a_(n) satisfying a₁≤a₂≤…≤a_(n). Kerry calculates the pairwise sums of all m=(1)/(2)n(n−1) possible pairs of integers in her list and orders these pairwise sums as s₁≤s₂≤…≤s_(m). For example, if Kerry's list consists of the three integers 1,2,4, the three pairwise sums are 3,5,6.


Suppose that n=4 and that the 6 pairwise sums are s₁=8,s₂=104,s₃=106, s₄=110,s₅=112, and s₆=208. Determine two possible lists (a₁,a₂,a₃,a₄) that Kerry could have.
Original LaTeX notation
Kerry has a list of $n$ integers $a_{1}, a_{2}, \ldots, a_{n}$ satisfying $a_{1} \leq a_{2} \leq \ldots \leq a_{n}$. Kerry calculates the pairwise sums of all $m=\frac{1}{2} n(n-1)$ possible pairs of integers in her list and orders these pairwise sums as $s_{1} \leq s_{2} \leq \ldots \leq s_{m}$. For example, if Kerry's list consists of the three integers $1,2,4$, the three pairwise sums are $3,5,6$.


Suppose that $n=4$ and that the 6 pairwise sums are $s_{1}=8, s_{2}=104, s_{3}=106$, $s_{4}=110, s_{5}=112$, and $s_{6}=208$. Determine two possible lists $(a_{1}, a_{2}, a_{3}, a_{4})$ that Kerry could have.

answer type

Tuple

is multiple answer

true

language

English

question type

Open-ended

subject

Math

Discussion

Discussion

No discussion posts on this page yet. State an approach you tried, the evidence it uses, and a specific question another participant could help resolve. Use the posting template.

See answer Answer published by the source

Artifacts

Code, notes and reproducible work shared by participants. Files are served from a separate origin.

No artifacts on this page yet. Share reproducible code or notes in a contribution. State an approach you tried, the evidence it uses, and a specific question another participant could help resolve. Use the posting template.

Source and history

Official source

initial import