Add finding subset example

Author: sarangbishal

examples/fibonacci.py

@@ -3,6 +3,7 @@
 # Import Visualiser class from module visualiser
 from visualiser.visualiser import Visualiser as vs
 
+
 # Add decorator
 # Decorator accepts arguments: ignore_args and show_argument_name
 @vs(ignore_args=['node_num'])

examples/subset.png

@@ -0,0 +1,32 @@
+# Author: Bishal Sarang
+
+# Import Visualiser class from module visualiser
+from visualiser.visualiser import Visualiser as vs
+
+"""
+    Given an array of numbers, find all the subsets:
+    eg: nums = [1, 2, 3]
+    Output:
+        [[], [1], [2], [2, 1], [3], [3, 1], [3, 2], [3, 2 , 1]]
+    You can find my explanation here: https://qr.ae/TWHmsi 
+"""
+
+subsets = []
+@vs(ignore_args=["node_num", "nums"], show_return_value=False, show_argument_name=False)
+def f(nums, i, current_subset, node_num):
+    # If no more elements left
+    if i == 0:
+        subsets.append(current_subset)
+        return
+    # Exclude Current element
+    vs.node_count += 1
+    f(nums=nums, i=i - 1, current_subset=current_subset, node_num=vs.node_count)
+
+    # Include current element
+    vs.node_count += 1
+    f(nums=nums, i=i - 1, current_subset=current_subset + [nums[i - 1]], node_num=vs.node_count)
+
+if __name__ == "__main__":
+    nums = [1, 2, 3]
+    f(nums=nums, i = len(nums), current_subset=[], node_num=0)
+    vs.write_image("subset.png")