32 lines
575 B
C++
32 lines
575 B
C++
#pragma once
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// http://ndevilla.free.fr/median/median/index.html
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size_t getWirthKthSmallest(std::vector<size_t> a, size_t k)
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{
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size_t l = 0;
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size_t m = a.size() - 1;
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while (l < m) {
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size_t x = a[k];
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size_t i = l;
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size_t j = m;
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do {
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while (a[i] < x) i++;
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while (x < a[j]) j--;
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if (i <= j) {
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std::swap(a[i], a[j]);
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i++;
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j--;
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}
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} while (i <= j);
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if (j < k) l = i;
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if (k < i) m = j;
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}
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return a[k];
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}
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