twoSum problem

Author: raianmol172

twoSum.py

@@ -0,0 +1,14 @@
+# two sum is a problem where we need to find the pair which sum up to some particular value let say 7
+# here we use hash table for solving these problem which make its complexity O(n)
+
+def twoSum(arr, target):
+    store = {}  # dictionary hash table
+    for i in range(len(arr)):
+        if arr[i] in store:
+            return [store[arr[i]], i]
+        else:
+            store[target - arr[i]] = i
+
+
+arr = [1, 2, 6, 3, 9]
+print(twoSum(arr, 7))