0560-subarray-sum-equals-k.py added and Updated README (#2039)

* 0560-subarray-sum-equals-k.py added and Updated README

* 0560-subarray-sum-equals-k.py added and Updated README

* Added Python Solution for 0560-subarray-sum-equlas-k

Author: AakashPawanGPS

python/0560-subarray-sum-equals-k.py

@@ -0,0 +1,18 @@
+class Solution:
+    def subarraySum(self, nums: List[int], k: int) -> int:
+        count = 0
+        sum = 0
+        dic = {}
+        dic[0] = 1
+        for i in range(len(nums)):
+            sum += nums[i]
+            if sum-k in dic:
+                count += dic[sum-k]
+            dic[sum] = dic.get(sum, 0)+1
+        return count
+
+# Time Complexity :
+#     O(N) -> Where N is the size of the array and we are iterating over the array once
+
+# Space Complexity:
+#     O(N) -> Creating a hashmap/dictionary