Oct22: Sliding window [E]

Time: O(N), Space: O(1)

daily/Oct22.cc

@@ -0,0 +1,34 @@
+#include <iostream>
+using namespace std;
+
+class Solution {
+ public:
+  /**
+   * @brief LC3184: Count pairs that form a complete day I
+   * Time: O(N) cause we use sliding window, Space: O(1)
+   *
+   * @param hours
+   * @return int
+   */
+  int countCompleteDayPairs(vector<int>& hours) {
+    int len = hours.size();
+    int le = 0, ri = le + 1;
+    if (len == 1) return 0;
+    int ans = 0;
+
+    while (le < len - 1) {
+      if ((hours[le] + hours[ri]) % 24 == 0) {
+        ans++;
+      }
+
+      if (ri < len - 1) {
+        ri++;
+      } else {
+        le++;
+        ri = le + 1;
+      }
+    }
+
+    return ans;
+  }
+};