WinnerTree

BinaryTree/tournamentTree/WinnerTree/winnerTree.h

@@ -0,0 +1,95 @@
+//
+// Created by PC on 25-8-11.
+//
+
+#ifndef WINNERTREE_H
+#define WINNERTREE_H
+#include <algorithm>
+#include <iostream>
+#include <deque>
+
+template <class T>
+class winnerTree {
+private:
+    std::deque<T> data;
+    int playerNum;
+    bool isInit = false;
+public:
+    winnerTree() : playerNum(0) {}
+    winnerTree(const std::deque<T>& d,int playerNum) : playerNum(playerNum), data(d) {}
+    ~winnerTree() = default;
+
+    void init();
+    int winner();
+    void replay(const T& player, const T& alter);
+    void display();
+};
+
+template<class T>
+void winnerTree<T>::init() {
+    for (int i = 0; i < 2 * playerNum - 2; i+=2) {
+        T max = std::max(data.at(i), data.at(i + 1));
+        data.push_back(max);
+    }
+    std::reverse(data.begin(), data.end());
+    isInit = true;
+}
+
+template<class T>
+int winnerTree<T>::winner() {
+    if (!isInit) {
+        std::cout << "Uninitialized!" << std::endl;
+        return -1;
+    }
+    return data.front();
+}
+
+template<class T>
+void winnerTree<T>::replay(const T &player, const T &alter) {
+    int index = -1;
+    // 查找叶子节点（可改为用player id更稳妥）
+    for (int i = data.size() - playerNum; i < data.size(); i++) {
+        if (data[i] == player) {
+            data[i] = alter;
+            index = i;
+            break;
+        }
+    }
+    if (index == -1) {
+        std::cout << "No such player!" << std::endl;
+        return;
+    }
+    // 向上调整父节点
+    while (index > 0) {
+        int parent = (index - 1) / 2;
+        int against = (index % 2 == 0) ? index - 1 : index + 1;
+
+        // 判断against是否越界
+        if (against >= data.size()) against = index; // 没对手时自己跟自己比
+
+        T maxVal = std::max(data.at(index), data.at(against));
+
+        if (data.at(parent) == maxVal) {
+            break; // 父节点胜者不变，提前结束
+        }
+        data.at(parent) = maxVal;
+        index = parent;
+    }
+}
+
+
+template<class T>
+void winnerTree<T>::display() {
+    int cnt = 1;
+    int jmp = 1;
+    for (int i = 0; i < data.size(); ++i) {
+        cnt--;
+        std::cout << data.at(i) << " ";
+        if (cnt == 0) {
+            std::cout << std::endl;
+            jmp *= 2;
+            cnt = jmp;
+        }
+    }
+}
+#endif //WINNERTREE_H