Create 1299-Replace-Elements-with-Greatest-Element-on-Right-Side.cpp

cpp/1299-Replace-Elements-with-Greatest-Element-on-Right-Side.cpp

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+class Solution {
+public:
+    vector<int> replaceElements(vector<int>& arr) {
+    // O(N) Time Complexity , O(1) Space complexity
+      int n = arr.size();
+      int maxSoFar = arr[n-1];
+      arr[n-1] = -1;
+
+      for(int i=n-2;i>=0;i--)
+      {
+        int temp = maxSoFar;
+        if(maxSoFar < arr[i]) maxSoFar = arr[i];
+        arr[i] = temp;
+      }
+      return arr;
+    }
+};

cpp/392-Is-Subsequence.cpp

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+// Time Complexity is O(N) where n is the size of the target string.
+// Space Complexity is O(1)
+
+class Solution {
+public:
+   bool isSubsequence(string s, string t) {
+      int i = 0 , j = 0;
+      while(j < s.size() && i < t.size())
+      {
+        if(s[j] == t[i])
+          j++;
+
+       i++;
+      }
+
+      if(j >= s.size()) return true;
+      return false;
+    }
+};