Initial commit for question 54

zhedahht · Nov 26, 2016 · c23f6a9 · c23f6a9
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diff --git a/54_KthNodeInBST/54_KthNodeInBST.vcxproj b/54_KthNodeInBST/54_KthNodeInBST.vcxproj
@@ -0,0 +1,155 @@
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diff --git a/54_KthNodeInBST/KthNodeInBST.cpp b/54_KthNodeInBST/KthNodeInBST.cpp
@@ -0,0 +1,188 @@
+//==================================================================
+// 《剑指Offer——名企面试官精讲典型编程题》代码
+// 作者：何海涛
+//==================================================================
+
+// 面试题54：二叉搜索树的第k个结点
+// 题目：给定一棵二叉搜索树，请找出其中的第k大的结点。
+
+#include <cstdio>
+#include "../Utilities/BinaryTree.h"
+
+const BinaryTreeNode* KthNodeCore(const BinaryTreeNode* pRoot, unsigned int& k);
+
+const BinaryTreeNode* KthNode(const BinaryTreeNode* pRoot, unsigned int k)
+{
+    if(pRoot == nullptr || k == 0)
+        return nullptr;
+
+    return KthNodeCore(pRoot, k);
+}
+
+const BinaryTreeNode* KthNodeCore(const BinaryTreeNode* pRoot, unsigned int& k)
+{
+    const BinaryTreeNode* target = nullptr;
+
+    if(pRoot->m_pLeft != nullptr)
+        target = KthNodeCore(pRoot->m_pLeft, k);
+
+    if(target == nullptr)
+    {
+        if(k == 1)
+            target = pRoot;
+
+        k--;
+    }
+
+    if(target == nullptr && pRoot->m_pRight != nullptr)
+        target = KthNodeCore(pRoot->m_pRight, k);
+
+    return target;
+}
+
+// ====================测试代码====================
+void Test(const char* testName, const BinaryTreeNode* pRoot, unsigned int k, bool isNull, int expected)
+{
+    if(testName != nullptr)
+        printf("%s begins: ", testName);
+
+    const BinaryTreeNode* pTarget = KthNode(pRoot, k);
+    if((isNull && pTarget == nullptr) || (!isNull && pTarget->m_nValue == expected))
+        printf("Passed.\n");
+    else
+        printf("FAILED.\n");
+}
+
+//            8
+//        6      10
+//       5 7    9  11
+void TestA()
+{
+    BinaryTreeNode* pNode8 = CreateBinaryTreeNode(8);
+    BinaryTreeNode* pNode6 = CreateBinaryTreeNode(6);
+    BinaryTreeNode* pNode10 = CreateBinaryTreeNode(10);
+    BinaryTreeNode* pNode5 = CreateBinaryTreeNode(5);
+    BinaryTreeNode* pNode7 = CreateBinaryTreeNode(7);
+    BinaryTreeNode* pNode9 = CreateBinaryTreeNode(9);
+    BinaryTreeNode* pNode11 = CreateBinaryTreeNode(11);
+
+    ConnectTreeNodes(pNode8, pNode6, pNode10);
+    ConnectTreeNodes(pNode6, pNode5, pNode7);
+    ConnectTreeNodes(pNode10, pNode9, pNode11);
+
+    Test("TestA0", pNode8, 0, true, -1);
+    Test("TestA1", pNode8, 1, false, 5);
+    Test("TestA2", pNode8, 2, false, 6);
+    Test("TestA3", pNode8, 3, false, 7);
+    Test("TestA4", pNode8, 4, false, 8);
+    Test("TestA5", pNode8, 5, false, 9);
+    Test("TestA6", pNode8, 6, false, 10);
+    Test("TestA7", pNode8, 7, false, 11);
+    Test("TestA8", pNode8, 8, true, -1);
+
+    DestroyTree(pNode8);
+
+    printf("\n\n");
+}
+
+//               5
+//              /
+//             4
+//            /
+//           3
+//          /
+//         2
+//        /
+//       1
+void TestB()
+{
+    BinaryTreeNode* pNode5 = CreateBinaryTreeNode(5);
+    BinaryTreeNode* pNode4 = CreateBinaryTreeNode(4);
+    BinaryTreeNode* pNode3 = CreateBinaryTreeNode(3);
+    BinaryTreeNode* pNode2 = CreateBinaryTreeNode(2);
+    BinaryTreeNode* pNode1 = CreateBinaryTreeNode(1);
+
+    ConnectTreeNodes(pNode5, pNode4, nullptr);
+    ConnectTreeNodes(pNode4, pNode3, nullptr);
+    ConnectTreeNodes(pNode3, pNode2, nullptr);
+    ConnectTreeNodes(pNode2, pNode1, nullptr);
+
+    Test("TestB0", pNode5, 0, true, -1);
+    Test("TestB1", pNode5, 1, false, 1);
+    Test("TestB2", pNode5, 2, false, 2);
+    Test("TestB3", pNode5, 3, false, 3);
+    Test("TestB4", pNode5, 4, false, 4);
+    Test("TestB5", pNode5, 5, false, 5);
+    Test("TestB6", pNode5, 6, true, -1);
+
+    DestroyTree(pNode5);
+
+    printf("\n\n");
+}
+
+// 1
+//  \
+//   2
+//    \
+//     3
+//      \
+//       4
+//        \
+//         5
+void TestC()
+{
+    BinaryTreeNode* pNode1 = CreateBinaryTreeNode(1);
+    BinaryTreeNode* pNode2 = CreateBinaryTreeNode(2);
+    BinaryTreeNode* pNode3 = CreateBinaryTreeNode(3);
+    BinaryTreeNode* pNode4 = CreateBinaryTreeNode(4);
+    BinaryTreeNode* pNode5 = CreateBinaryTreeNode(5);
+
+    ConnectTreeNodes(pNode1, nullptr, pNode2);
+    ConnectTreeNodes(pNode2, nullptr, pNode3);
+    ConnectTreeNodes(pNode3, nullptr, pNode4);
+    ConnectTreeNodes(pNode4, nullptr, pNode5);
+
+    Test("TestC0", pNode1, 0, true, -1);
+    Test("TestC1", pNode1, 1, false, 1);
+    Test("TestC2", pNode1, 2, false, 2);
+    Test("TestC3", pNode1, 3, false, 3);
+    Test("TestC4", pNode1, 4, false, 4);
+    Test("TestC5", pNode1, 5, false, 5);
+    Test("TestC6", pNode1, 6, true, -1);
+
+    DestroyTree(pNode1);
+
+    printf("\n\n");
+}
+
+// There is only one node in a tree
+void TestD()
+{
+    BinaryTreeNode* pNode1 = CreateBinaryTreeNode(1);
+
+    Test("TestD0", pNode1, 0, true, -1);
+    Test("TestD1", pNode1, 1, false, 1);
+    Test("TestD2", pNode1, 2, true, -1);
+
+    DestroyTree(pNode1);
+
+    printf("\n\n");
+}
+
+// empty tree
+void TestE()
+{
+    Test("TestE0", nullptr, 0, true, -1);
+    Test("TestE1", nullptr, 1, true, -1);
+
+    printf("\n\n");
+}
+
+int main(int argc, char* argv[])
+{
+    TestA();
+    TestB();
+    TestC();
+    TestD();
+    TestE();
+}
diff --git a/CodingInterviewChinese2.sln b/CodingInterviewChinese2.sln
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 EndProject
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