Create adding-two-negabinary-numbers.cpp

Author: kamyu104

C++/adding-two-negabinary-numbers.cpp

@@ -0,0 +1,25 @@
+// Time:  O(n)
+// Space: O(n)
+
+class Solution {
+public:
+    vector<int> addNegabinary(vector<int>& arr1, vector<int>& arr2) {
+        vector<int> result;
+        int carry = 0, i = arr1.size() - 1, j = arr2.size() - 1;
+        while (i >= 0 || j >= 0 || carry) {
+            if (i >= 0) {
+                carry += arr1[i--];
+            }
+            if (j >= 0) {
+                carry += arr2[j--];
+            }
+            result.emplace_back(carry & 1);
+            carry = -(carry >> 1);
+        }
+        while (result.size() > 1 && result.back() == 0) {
+            result.pop_back();
+        }
+        reverse(result.begin(), result.end());
+        return result;
+    }
+};