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project_euler/pe/p201.html
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<meta name="author" content="Colin Hughes" />
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<meta name="description" content="A website dedicated to the fascinating world of mathematics and programming" />
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<meta name="keywords" content="programming,mathematics,problems,puzzles" />
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<title>Problem 201 - Project Euler</title>
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<div style="text-align:center;" class="print"><img src="images/pe_banner.png" alt="projecteuler.net" style="border:none;" /></div>
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<h2>Subsets with a unique sum</h2><div class="info" style="cursor:help;width:200px;margin-bottom:10px;"><h3>Problem 201</h3><span style="width:300px;color:#666;">Published on Saturday, 5th July 2008, 02:00 pm; Solved by 1189</span></div>
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<div class="problem_content" role="problem">
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<p>For any set A of numbers, let sum(A) be the sum of the elements of A.<br />
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Consider the set B = {1,3,6,8,10,11}.<br /> There are 20 subsets of B containing three elements, and their sums are:</p>
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<p style="margin-left:100px">
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sum({1,3,6}) = 10,<br />
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sum({1,3,8}) = 12,<br />
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sum({1,3,10}) = 14,<br />
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sum({1,3,11}) = 15,<br />
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sum({1,6,8}) = 15,<br />
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sum({1,6,10}) = 17,<br />
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sum({1,6,11}) = 18,<br />
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sum({1,8,10}) = 19,<br />
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sum({1,8,11}) = 20,<br />
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sum({1,10,11}) = 22,<br />
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sum({3,6,8}) = 17,<br />
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sum({3,6,10}) = 19,<br />
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sum({3,6,11}) = 20,<br />
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sum({3,8,10}) = 21,<br />
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sum({3,8,11}) = 22,<br />
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sum({3,10,11}) = 24,<br />
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sum({6,8,10}) = 24,<br />
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sum({6,8,11}) = 25,<br />
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sum({6,10,11}) = 27,<br />
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sum({8,10,11}) = 29.</p>
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<p>Some of these sums occur more than once, others are unique.<br />
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For a set A, let U(A,k) be the set of unique sums of k-element subsets of A, in our example we find U(B,3) = {10,12,14,18,21,25,27,29} and sum(U(B,3)) = 156.</p>
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<p>Now consider the 100-element set S = {1<sup>2</sup>, 2<sup>2</sup>, ... , 100<sup>2</sup>}.<br />
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S has 100891344545564193334812497256 50-element subsets.</p>
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<p>Determine the sum of all integers which are the sum of exactly one of the 50-element subsets of S, i.e. find sum(U(S,50)).</p>
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