From eb931a74c9aaaaa64d4011c9f0cccbb06e423e93 Mon Sep 17 00:00:00 2001
From: Stoycho Kyosev <stoycho.kk@gmail.com>
Date: Mon, 12 Dec 2022 23:50:06 +0200
Subject: Add solution to exam task

---
 Seminar09/exam1.cpp | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 Seminar09/exam1.cpp

diff --git a/Seminar09/exam1.cpp b/Seminar09/exam1.cpp
new file mode 100644
index 0000000..e8d4526
--- /dev/null
+++ b/Seminar09/exam1.cpp
@@ -0,0 +1,54 @@
+#include"../Seminar08/tree-utils.h"
+
+// pair.first -> Сумата до момента
+// pair.second - Броя на наследниците, които изпълняват условието ключовете им да влизат в интервала в поддървото
+std::pair<int, int> findSumHelper(const Tree<int>* t, int x, int y) {
+    if(t == nullptr)
+        return std::make_pair(0, 0);
+
+    std::pair<int, int> l = std::make_pair(0, 0);
+    std::pair<int, int> r = std::make_pair(0, 0);
+
+    if(t->data >= x)
+        l  = findSumHelper(t->left, x, y);
+
+    if(t->data <= y)
+        r = findSumHelper(t->right, x, y);
+
+    bool oddChildren = ((l.second + r.second) % 2);
+
+    int sum = l.first + r.first;
+    int count = l.second + r.second + (t->data >= x && t->data <= y);
+
+    if(oddChildren)
+        sum += t->data;
+
+    return std::make_pair(sum, count);
+}
+
+int findSum(const Tree<int>* t, int x, int y) {
+    return findSumHelper(t, x, y).first;
+}
+
+int main() {
+    Tree<int>* root = new Tree<int>(50);
+	Tree<int>* n1 = new Tree<int>(25);
+	Tree<int>* n2 = new Tree<int>(75);
+	Tree<int>* n3 = new Tree<int>(12);
+	Tree<int>* n4 = new Tree<int>(30);
+	Tree<int>* n5 = new Tree<int>(60);
+	Tree<int>* n6 = new Tree<int>(85);
+	Tree<int>* n7 = new Tree<int>(52);
+	Tree<int>* n8 = new Tree<int>(70);
+
+	root->left = n1;
+	root->right = n2;
+	n1->left = n3;
+	n1->right = n4;
+	n2->left = n5;
+	n2->right = n6;
+	n5->left = n7;
+	n5->right = n8;
+
+	std::cout << findSum(root, 30, 75);
+}
\ No newline at end of file
-- 
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