feat: demo of fast calculate class

src/core/fast_cal/internal/demo.cc

@@ -21,38 +21,130 @@ struct data_t {
     uint64_t back;
 };
 
-// TODO: try using `std::vector` + offset instead of `std::queue`
+// TODO: try wrapper as custom `std::queue`
+
+class FCDemo {
+public:
+    explicit FCDemo(RawCode raw_code) {
+        auto reserve = GroupUnion::from_raw_code(raw_code).max_group_size();
+        codes_.reserve(reserve);
+        cases_.reserve(reserve);
+        codes_.emplace_back(raw_code);
+        cases_.emplace(raw_code, data_t {0, 0}); // without mask
+    }
+
+    RawCode DoCal() {
+//        bool stop_flag = false;
+        uint64_t result = 0;
+        auto core = MaskMover([this, &result](uint64_t code, uint64_t mask) {
+            if (const auto match = cases_.find(code); match != cases_.end()) {
+                match->second.mask |= mask; // update mask
+                return;
+            }
+            cases_.emplace(code, data_t {
+                .mask = mask,
+                .back = codes_[offset_].unwrap(),
+            });
+            codes_.emplace_back(RawCode::unsafe_create(code));
+
+            if (((code >> 39) & 0b111) == 0b100) {
+//                stop_flag = true;
+                result = code;
+            }
+        });
+
+        while (offset_ != codes_.size()) {
+            auto curr = codes_[offset_].unwrap();
+            core.next_cases(curr, cases_.find(curr)->second.mask);
+            ++offset_;
+
+            if (result != 0) {
+                break;
+            }
+        }
+
+//        std::vector<RawCode> path;
+//        auto code = result;
+//        while (true) {
+//            if (code == 0) {
+//                break;
+//            }
+//            path.emplace_back(RawCode::unsafe_create(code));
+//            code = cases_.find(code)->second.back;
+//        }
+//        std::reverse(path.begin(), path.end());
+//        for (auto step : path) {
+//            std::cout << step << std::endl;
+//        }
+//        std::cout << path.size() << std::endl;
+
+	return codes_[offset_];
+    }
+
+private:
+    uint64_t offset_ {0};
+    std::vector<RawCode> codes_;
+    absl::flat_hash_map<uint64_t, data_t> cases_; // <code, mask>
+};
 
 RawCode FastCal_demo(RawCode raw_code) {
-    std::queue<RawCode> cache;
+
+    FCDemo fc {raw_code};
+    return fc.DoCal();
+
+//    std::queue<RawCode> cache;
+    std::vector<RawCode> codes;
     absl::flat_hash_map<uint64_t, data_t> cases; // <code, mask>
     auto reserve = GroupUnion::from_raw_code(raw_code).max_group_size();
+    codes.reserve(reserve);
     cases.reserve(reserve);
 
-    auto core = MaskMover([&cache, &cases](uint64_t code, uint64_t mask) {
+    uint64_t offset = 0;
+    bool stop_flag = false;
+    auto core = MaskMover([&codes, &cases, &offset, &stop_flag](uint64_t code, uint64_t mask) {
         if (const auto match = cases.find(code); match != cases.end()) {
             match->second.mask |= mask; // update mask
             return;
         }
         cases.emplace(code, data_t {
             .mask = mask,
-            .back = cache.front().unwrap(),
+            .back = codes[offset].unwrap(),
+//            .back = cache.front().unwrap(),
         });
-        cache.emplace(RawCode::unsafe_create(code));
+        codes.emplace_back(RawCode::unsafe_create(code));
+//        cache.emplace(RawCode::unsafe_create(code));
+        if (((code >> 39) & 0b111) == 0b100) {
+            stop_flag = true;
+        }
     });
 
-    cache.emplace(raw_code);
+    codes.emplace_back(raw_code);
+//    cache.emplace(raw_code);
     cases.emplace(raw_code, data_t {0, 0}); // without mask
 
-    while (!cache.empty()) {
-        if (((cache.front().unwrap() >> 39) & 0b111) == 0b100) {
+    while (offset != codes.size()) {
+        auto curr = codes[offset].unwrap();
+        core.next_cases(curr, cases.find(curr)->second.mask);
+        ++offset;
+
+        if (stop_flag) {
             break;
         }
-        uint64_t curr = cache.front().unwrap();
-        core.next_cases(curr, cases.find(curr)->second.mask);
-        cache.pop();
+
     }
 
+//    while (!cache.empty()) {
+//        if (((cache.front().unwrap() >> 39) & 0b111) == 0b100) {
+//            break;
+//        }
+//        uint64_t curr = cache.front().unwrap();
+//        core.next_cases(curr, cases.find(curr)->second.mask);
+//        cache.pop();
+//        if (stop_flag) {
+//            break;
+//        }
+//    }
+
 //    std::vector<RawCode> path;
 //    auto code = cache.front().unwrap();
 //    while (true) {
@@ -68,6 +160,7 @@ RawCode FastCal_demo(RawCode raw_code) {
 //    }
 //    std::cout << path.size() << std::endl;
 
-    return cache.front();
+    return codes[offset];
+//    return cache.front();
 
 }

src/core/main.cc

@@ -48,6 +48,7 @@ int main() {
 //        fc.solve();
 //        klotski::cases::Group_extend(code);
         FastCal_demo(code);
+        break;
     }
 
 //    for (int i = 0; i < 10000000; ++i) {