SS 2025

2023_Informatik_b/binarysearch.cpp

@@ -0,0 +1,34 @@
+// g++ -std=c++14 -Wall -Wextra -Werror -pedantic ./w4/binarysearch.cpp -o ./bin/binarysearch
+#include <iostream>
+#include <vector>
+int binarySearch(int query, std::vector<int> &elems)
+{
+    unsigned low = 0;
+    unsigned high = elems.size() - 1;
+    unsigned index = (low + high) / 2;
+    while (low < high)
+    {
+        if (query == elems[index])
+        {
+            return elems[index];
+        }
+        if (query < elems[index])
+        {
+            high = index - 1;
+        }
+        else
+        {
+            low = index + 1;
+        }
+        index = (low + high) / 2;
+    }
+    return elems[index];
+}
+int main()
+{
+    std::vector<int> searchtest = {1, 4, 6, 12, 19, 22, 34, 36, 100};
+    std::cout << "Binärsuche: " << binarySearch(36, searchtest) << std::endl;
+    std::cout << "Binärsuche: " << binarySearch(1000, searchtest) << std::endl;
+    std::cout << "Binärsuche: " << binarySearch(0, searchtest) << std::endl;
+    std::cout << "Binärsuche: " << binarySearch(5, searchtest) << std::endl;
+}