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added merge sort

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Ahmet Inan 2024-03-08 09:53:28 +01:00
commit d319189d7a
2 changed files with 37 additions and 7 deletions
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19
tests/sort_regression_test.cc
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@ -13,25 +13,30 @@ Copyright 2024 Ahmet Inan <inan@aicodix.de>
int main()
{
const int MAX_N = 128;
std::random_device rd;
typedef std::default_random_engine generator;
typedef std::uniform_int_distribution<int> distribution;
auto rand = std::bind(distribution(1, 32), generator(rd()));
int a[32], b[32], c[32], d[32], e[32], f[32];
auto rand = std::bind(distribution(1, MAX_N), generator(rd()));
int a[MAX_N], b[MAX_N], c[MAX_N], d[MAX_N], e[MAX_N], f[MAX_N], g[MAX_N];
CODE::MergeSort<int, MAX_N> merge_sort;
for (int loop = 0; loop < 1000000; ++loop) {
int size = rand();
for (int i = 0; i < size; ++i)
a[i] = b[i] = c[i] = d[i] = rand();
a[i] = b[i] = c[i] = d[i] = e[i] = rand();
std::sort(a, a+size);
CODE::insertion_sort(b, size);
for (int i = 0; i < size; ++i)
assert(a[i] == b[i]);
merge_sort(c, size);
for (int i = 0; i < size; ++i)
e[i] = i;
std::stable_sort(e, e+size, [c](int i, int j){ return c[i] < c[j]; });
CODE::insertion_sort(f, d, size);
assert(a[i] == c[i]);
for (int i = 0; i < size; ++i)
assert(e[i] == f[i]);
f[i] = i;
std::stable_sort(f, f+size, [d](int i, int j){ return d[i] < d[j]; });
CODE::insertion_sort(g, e, size);
for (int i = 0; i < size; ++i)
assert(f[i] == g[i]);
}
std::cerr << "Sorting regression test passed!" << std::endl;
return 0;