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Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
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Leonardo de Moura 2012-10-21 22:16:58 -07:00
parent 142bf71b35
commit 9359ab7ce5
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src/test/permutation.cpp Normal file
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/*++
Copyright (c) 2012 Microsoft Corporation
Module Name:
permutation.cpp
Abstract:
Simple abstraction for managing permutations.
Author:
Leonardo de Moura (leonardo) 2012-01-04
Revision History:
--*/
#include"permutation.h"
#include"util.h"
#include"vector.h"
using namespace std;
void apply_permutation_copy(unsigned sz, unsigned const * src, unsigned const * p, unsigned * target) {
for (unsigned i = 0; i < sz; i++) {
target[i] = src[p[i]];
}
}
static void tst1(unsigned sz, unsigned num_tries, unsigned max = UINT_MAX) {
unsigned_vector data;
unsigned_vector p;
unsigned_vector new_data;
data.resize(sz);
p.resize(sz);
new_data.resize(sz);
random_gen g;
for (unsigned i = 0; i < sz; i++)
p[i] = i;
// fill data with random numbers
for (unsigned i = 0; i < sz; i++)
data[i] = g() % max;
for (unsigned k = 0; k < num_tries; k ++) {
shuffle(p.size(), p.c_ptr(), g);
// std::cout << "p: "; display(std::cout, p.begin(), p.end()); std::cout << "\n";
// std::cout << "data: "; display(std::cout, data.begin(), data.end()); std::cout << "\n";
apply_permutation_copy(sz, data.c_ptr(), p.c_ptr(), new_data.c_ptr());
apply_permutation(sz, data.c_ptr(), p.c_ptr());
// std::cout << "data: "; display(std::cout, data.begin(), data.end()); std::cout << "\n";
for (unsigned i = 0; i < 0; i++)
SASSERT(data[i] == new_data[i]);
}
}
void tst_permutation() {
tst1(10, 1000, 5);
tst1(10, 1000, 1000);
tst1(10, 1000, UINT_MAX);
tst1(100, 1000, 33);
tst1(100, 1000, 1000);
tst1(100, 1000, UINT_MAX);
tst1(1000, 1000, 121);
tst1(1000, 1000, 1000);
tst1(1000, 1000, UINT_MAX);
tst1(33, 1000, 121);
tst1(33, 1000, 1000);
tst1(33, 1000, UINT_MAX);
tst1(121, 1000, 121);
tst1(121, 1000, 1000);
tst1(121, 1000, UINT_MAX);
for (unsigned i = 0; i < 1000; i++) {
tst1(1000, 2, 333);
tst1(1000, 2, 10000);
tst1(1000, 2, UINT_MAX);
}
random_gen g;
for (unsigned i = 0; i < 100000; i++) {
unsigned sz = (g() % 131) + 1;
tst1(sz, 1, sz*2);
tst1(sz, 1, UINT_MAX);
tst1(sz, 1, sz/2 + 1);
}
}