add solutions

2 files changed, 104 insertions, 0 deletions

diff --git a/challenge-253/witawayar/cpp/ch-1.cpp b/challenge-253/witawayar/cpp/ch-1.cpp
new file mode 100644
index 0000000000..9f0c138e5e
--- /dev/null
+++ b/challenge-253/witawayar/cpp/ch-1.cpp
@@ -0,0 +1,46 @@
+// g++ -Wall -Wextra -Wpedantic -std=c++17 cpp/ch-1.cpp
+#include <algorithm>  // remove_if
+#include <iostream>   // cout
+#include <sstream>    // stringstream
+#include <vector>
+
+std::vector<std::string> fun(std::vector<std::string> const& words, std::string separator) {
+    std::vector<std::string> parts;
+    std::size_t sep_size = separator.size();
+
+    for (auto& sub_word : words) {
+        std::size_t start = 0;
+        for (size_t found = sub_word.find(separator);
+             found != std::string::npos;
+             found = sub_word.find(separator, start)) {
+            parts.emplace_back(sub_word.begin() + start, sub_word.begin() + found);
+            start = found + sep_size;
+        }
+        if (start != sub_word.size())
+            parts.emplace_back(sub_word.begin() + start, sub_word.end());
+    }
+    parts.erase(std::remove_if(parts.begin(), parts.end(), [](std::string const& str) {
+        return str.find_first_not_of(' ') == std::string::npos; }), parts.end());
+
+    return parts;
+}
+
+int main(void) {
+    // Tests
+    std::vector<std::pair<std::pair<std::vector<std::string>, std::string>, std::vector<std::string>>> tests = {
+        {{{"one.two.three", "four.five", "six"}, "."}, {"one", "two", "three", "four", "five", "six"}},
+            {{{"$perl$$", "$$raku$"}, "$"}, {"perl", "raku"}}
+    };
+
+    for (const auto& [input, expected_output] : tests) {
+        auto [words, separator] = input;
+        auto got = fun(words, separator);
+        if (got != expected_output) {
+            std::stringstream error_msg;
+            error_msg << "Failed at " << separator;
+            throw std::runtime_error(error_msg.str());
+        }
+    }
+
+    std::cout << "done-testing, success\n";
+}
diff --git a/challenge-253/witawayar/cpp/ch-2.cpp b/challenge-253/witawayar/cpp/ch-2.cpp
new file mode 100644
index 0000000000..cd14a85981
--- /dev/null
+++ b/challenge-253/witawayar/cpp/ch-2.cpp
@@ -0,0 +1,58 @@
+// g++ -Wall -Wextra -Wpedantic -std=c++17 cpp/ch-2.cpp
+#include <algorithm>  // transform
+#include <iostream>   // cout
+#include <numeric>    // accumulate
+#include <sstream>    // stringstream
+#include <tuple>      // tie
+#include <vector>
+
+std::vector<int> fun(std::vector<std::vector<int>> const& matrix) {
+    std::vector<std::pair<int, std::vector<int>>> aug_matrix;
+    for (std::size_t idx{0}; idx < matrix.size(); ++idx) {
+        aug_matrix.emplace_back(idx, matrix[idx]);
+    }
+    std::sort(aug_matrix.begin(), aug_matrix.end(),
+              [](auto& vec_a, auto& vec_b) {
+                  auto a_sum = std::accumulate(vec_a.second.cbegin(), vec_a.second.cend(), 0);
+                  auto b_sum = std::accumulate(vec_b.second.cbegin(), vec_b.second.cend(), 0);
+                  return std::tie(a_sum, vec_a.first) < std::tie(b_sum, vec_b.first);
+              });
+    std::vector<int> sorter_indexes;
+    std::transform(aug_matrix.cbegin(), aug_matrix.cend(),
+                   std::back_inserter(sorter_indexes),
+                   [](auto& pair) { return pair.first; });
+    return sorter_indexes;
+}
+
+int main(void) {
+    // Tests
+    std::vector<std::pair<std::vector<std::vector<int>>, std::vector<int>>> tests = {
+        {
+            {
+                {1, 1, 0, 0, 0},
+                    {1, 1, 1, 1, 0},
+                    {1, 0, 0, 0, 0},
+                    {1, 1, 0, 0, 0},
+                    {1, 1, 1, 1, 1}
+            }, {2, 0, 3, 1, 4}},
+        {
+            {
+                {1, 0, 0, 0},
+                {1, 1, 1, 1},
+                {1, 0, 0, 0},
+                {1, 0, 0, 0}
+            }, {0, 2, 3, 1}}
+    };
+
+    std::size_t test_case{0};
+    for (const auto& [input, expected_output] : tests) {
+        auto got = fun(input);
+        if (got != expected_output) {
+            std::stringstream error_msg;
+            error_msg << "Failed at " << test_case++ << "th test case";
+            throw std::runtime_error(error_msg.str());
+        }
+    }
+
+    std::cout << "done-testing, success\n";
+}