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40 lines
891 B
C++
40 lines
891 B
C++
/*
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Test for the Quick select algorithm
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Copyright 2024 Ahmet Inan <inan@aicodix.de>
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*/
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#include <random>
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#include <cassert>
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#include <iostream>
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#include <functional>
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#include "quick.hh"
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int main()
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{
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const int MAX_N = 1 << 16;
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unsigned seed = 42;
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if (1) {
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std::random_device rd;
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seed = rd();
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}
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typedef std::default_random_engine generator;
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typedef std::uniform_int_distribution<int> distribution;
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auto rand = std::bind(distribution(1, MAX_N), generator(seed));
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int a[MAX_N];
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for (int loop = 0; loop < 10000; ++loop) {
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int size = rand();
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for (int i = 0; i < size; ++i)
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a[i] = rand();
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int k = rand() % size;
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int v = DSP::quick_select(a, k, size);
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assert(v == a[k]);
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for (int i = 0; i < k; ++i)
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assert(a[i] <= a[k]);
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for (int i = k + 1; i < size; ++i)
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assert(a[i] >= a[k]);
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}
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std::cerr << "Quick select algorithm test passed!" << std::endl;
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return 0;
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}
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