Added sliding window

tests/test.cpp

@@ -32,6 +32,20 @@ TEST(ChapterOne, CheckPermutations){
 
 }
 
+TEST(ChapterOne, SubArraySum){
+  // Not actually in CTCI but is related to arrays
+
+  // Prompt: Given an array, find the sum of all subarrays of length K
+  // (fixed sliding window)
+  int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
+  CHECK_EQUAL(27, sliding_window_max_sum(a1, 11, 3));
+
+  // Prompt: Find the shortest subarray with a sum greater than or
+  // equal to X (dynamic sliding window)
+  int a2[] = {0, 1, 2, 3, 4, 5, 6, 7, 8};
+  CHECK_EQUAL(1, sliding_window_shortest_subarray(a2, 9, 7));
+}
+
 // Chapter 2: Linked Lists ___________________________________________
 
 TEST_GROUP(ChapterTwo){};