update: build all groups

src/klotski_core/ffi/tmain.cc

@@ -31,7 +31,12 @@ void tmain() {
 //    auto ret = Group::build_groups(0);
 //    std::cout << ret[0].size() << std::endl;
 
-    Group::build_groups(123);
+//    auto g = Group::build_groups(123);
+//    std::cout << g.size() << std::endl;
+
+    for (uint32_t type_id = 0; type_id < 204; ++type_id) {
+        std::cout << Group::build_groups(type_id).size() << std::endl;
+    }
 
 //    printf("tmain exit\n");
 }

src/klotski_core/group/group.cc

@@ -80,98 +80,37 @@ std::vector<RawCode> Group::group_cases(const RawCode &seed) {
 
 std::vector<std::vector<CommonCode>> Group::build_groups(uint32_t type_id) {
     auto all_cases = Group::all_cases(type_id);
-    if (all_cases.empty()) { // match type_id TODO: ??? (7-0-0)
-        return {};
+    if (all_cases.empty()) {
+        return {}; // type 203 -> no element
     }
 
     std::vector<std::vector<CommonCode>> groups;
-    auto min = std::min_element(all_cases.begin(), all_cases.end());
-    auto first_group = Group::group_cases(min->to_raw_code());
+    auto min = std::min_element(all_cases.begin(), all_cases.end()); // search min CommonCode
+    auto first_group = Group::group_cases(min->to_raw_code()); // expand the first group
     groups.emplace_back(first_group.begin(), first_group.end());
     if (first_group.size() == all_cases.size()) { // only contains one group
-
-//        std::vector<CommonCode> rs(k.begin(), k.end());
-//        std::vector<CommonCode> rs;
-//        rs.reserve(k.size());
-
-//        for (auto &&rr : k) {
-//
-//            std::cout << rr.to_common_code() << std::endl;
-
-//            rs.emplace_back(rr.to_common_code());
-//        }
-
-//        std::sort(rs.begin(), rs.end());
-//
-//        for (auto &&rr : rs) {
-//            std::cout << rr << std::endl;
-//        }
-
-//        std::cout << r[0] << std::endl;
-
-//        std::cout << k[0].to_common_code() << std::endl;
-
-//        return
-
         return groups;
     }
 
-
-    // TODO: reuse first_group
-
-
-
     std::set<CommonCode> cases(all_cases.begin(), all_cases.end());
-
     for (auto &&tmp : groups[0]) {
-
-//        auto c = tmp.to_common_code();
-
-        cases.erase(tmp);
-
-//        current_group->emplace_back(c);
-
+        cases.erase(tmp); // remove elements in first group
     }
-
-
-//    std::set<CommonCode> cases;
-
-//    uint32_t index = 0;
-//    for (auto &&tmp : all_cases) {
-//        if
-//    }
-
-//    std::cout << cases.size() << std::endl;
-//    std::cout << all_cases.size() << std::endl;
-
-
     while (!cases.empty()) {
-        auto ret = Group::group_cases(cases.begin()->to_raw_code());
-
-        groups.emplace_back();
-
-        auto current_group = groups.end() - 1;
-
-        for (auto &&tmp : ret) {
-
-            auto c = tmp.to_common_code();
-
-            cases.erase(c);
-
-            current_group->emplace_back(c);
-
+        groups.emplace_back(); // create empty vector
+        auto current_group = groups.end() - 1; // insert into latest
+        for (auto &&tmp : Group::group_cases(cases.begin()->to_raw_code())) {
+            auto common_code = tmp.to_common_code();
+            current_group->emplace_back(common_code); // insert into current group
+            cases.erase(common_code); // remove from global union
         }
-
     }
 
-    std::stable_sort(groups.begin(), groups.end(), [](const std::vector<CommonCode> &c1, const std::vector<CommonCode> &c2) {
-        return c1.size() < c2.size();
-    });
-
-    std::cout << groups.size() << std::endl;
-
-
-    return std::vector<std::vector<CommonCode>>();
+    auto compare_func = [](const std::vector<CommonCode> &v1, const std::vector<CommonCode> &v2) {
+        return v1.size() < v2.size(); // sort by vector size
+    };
+    std::stable_sort(groups.begin(), groups.end(), compare_func); // using stable sort for ordered index
+    return groups;
 }
 
 } // namespace klotski