From 04368ad24f28250401393f1096c9f6a323e9ef7a Mon Sep 17 00:00:00 2001
From: "E. Choroba" <choroba@matfyz.cz>
Date: Mon, 15 Jan 2024 12:35:05 +0100
Subject: Solve 252: Special Numbers & Unique Sum Zero by E. Choroba

---
 challenge-252/e-choroba/perl/ch-1.pl | 16 ++++++++++++++++
 challenge-252/e-choroba/perl/ch-2.pl | 20 ++++++++++++++++++++
 2 files changed, 36 insertions(+)
 create mode 100755 challenge-252/e-choroba/perl/ch-1.pl
 create mode 100755 challenge-252/e-choroba/perl/ch-2.pl

diff --git a/challenge-252/e-choroba/perl/ch-1.pl b/challenge-252/e-choroba/perl/ch-1.pl
new file mode 100755
index 0000000000..6b5022d0c3
--- /dev/null
+++ b/challenge-252/e-choroba/perl/ch-1.pl
@@ -0,0 +1,16 @@
+#!/usr/bin/perl
+use warnings;
+use strict;
+use experimental qw( signatures );
+
+use List::Util qw{ sum };
+
+sub special_numbers(@ints) {
+    my @s = @ints[grep 0 == @ints % ($_ + 1), 0 .. $#ints];
+    return sum(map $_ * $_, @s)
+}
+
+use Test::More tests => 2;
+
+is special_numbers(1, 2, 3, 4), 21, 'Example 1';
+is special_numbers(2, 7, 1, 19, 18, 3), 63, 'Example 2';
diff --git a/challenge-252/e-choroba/perl/ch-2.pl b/challenge-252/e-choroba/perl/ch-2.pl
new file mode 100755
index 0000000000..321c4500cc
--- /dev/null
+++ b/challenge-252/e-choroba/perl/ch-2.pl
@@ -0,0 +1,20 @@
+#!/usr/bin/perl
+use warnings;
+use strict;
+use experimental qw( signatures );
+
+sub unique_sum_zero($n) {
+    return [(0) x ($n % 2), map { $_, -$_ } 1 .. $n / 2]
+}
+
+use Test::More tests => 7;
+use List::Util qw{ sum uniq };
+
+subtest "n=$_" => sub {
+    plan tests => 3;
+    my $output = unique_sum_zero($_);
+    is scalar @$output, $_, 'length';
+    my @u = uniq(@$output);
+    is scalar @u, $_, 'uniq';
+    is sum(@$output), 0, 'sum 0';
+} for 1 .. 7;
-- 
cgit 


From 9282ab98cbd52bace35f36e5cff3e6366a85b6fb Mon Sep 17 00:00:00 2001
From: "E. Choroba" <choroba@matfyz.cz>
Date: Mon, 15 Jan 2024 18:32:09 +0100
Subject: Add C++ solutions

---
 challenge-252/e-choroba/cpp/ch-1.cpp | 21 ++++++++++++++++++
 challenge-252/e-choroba/cpp/ch-2.cpp | 41 ++++++++++++++++++++++++++++++++++++
 2 files changed, 62 insertions(+)
 create mode 100644 challenge-252/e-choroba/cpp/ch-1.cpp
 create mode 100644 challenge-252/e-choroba/cpp/ch-2.cpp

diff --git a/challenge-252/e-choroba/cpp/ch-1.cpp b/challenge-252/e-choroba/cpp/ch-1.cpp
new file mode 100644
index 0000000000..ec85e36bf0
--- /dev/null
+++ b/challenge-252/e-choroba/cpp/ch-1.cpp
@@ -0,0 +1,21 @@
+#include <cassert>
+#include <cmath>
+#include <iostream>
+#include <vector>
+
+long special_numbers(std::vector<long> ints) {
+    size_t s = ints.size();
+    long r = 0;
+    for (size_t i = 0; i <= s; ++i) {
+        if (s % (i + 1) == 0) {
+            r += std::pow(ints[i], 2);
+        }
+    }
+    return r;
+}
+
+int main(int argc, char* argv[]) {
+    assert(special_numbers({1, 2, 3, 4}) == 21);
+    assert(special_numbers({2, 7, 1, 19, 18, 3}) == 63);
+    std::cout << "Ok." << std::endl;
+}
diff --git a/challenge-252/e-choroba/cpp/ch-2.cpp b/challenge-252/e-choroba/cpp/ch-2.cpp
new file mode 100644
index 0000000000..e10d27aae6
--- /dev/null
+++ b/challenge-252/e-choroba/cpp/ch-2.cpp
@@ -0,0 +1,41 @@
+#include <cassert>
+#include <iostream>
+#include <vector>
+
+std::vector<int> unique_sum_zero(int n) {
+    std::vector<int> v;
+    if (n % 2) {
+        v = {0};
+    }
+    for (int i = 1; i <= n / 2; ++i) {
+        v.insert(v.end(), {i, -i});
+    }
+    return v;
+}
+
+int main(int argc, char* argv[]) {
+
+    auto u1 = unique_sum_zero(1);
+    assert(u1.size() == 1);
+    assert(u1[0] == 0);
+
+    auto u2 = unique_sum_zero(2);
+    assert(u2.size() == 2);
+    assert(u2[0] == 1);
+    assert(u2[1] == -1);
+
+    auto u3 = unique_sum_zero(3);
+    assert(u3.size() == 3);
+    assert(u3[0] == 0);
+    assert(u3[1] == 1);
+    assert(u3[2] == -1);
+
+    auto u4 = unique_sum_zero(4);
+    assert(u4.size() == 4);
+    assert(u4[0] == 1);
+    assert(u4[1] == -1);
+    assert(u4[2] == 2);
+    assert(u4[3] == -2);
+
+    std::cout << "Ok." << std::endl;
+}
-- 
cgit