Add solution to Problem 228

solutions/problem_228.py

@@ -0,0 +1,33 @@
+def get_largest(nums, prefix=""):
+    num_dict = dict()
+    for num in nums:
+        str_num = str(num)
+        fdig = str_num[0]
+        if fdig not in num_dict:
+            num_dict[fdig] = list()
+        num_dict[fdig].append(str_num)
+
+    sorted_arrs = sorted(num_dict.values(), key=lambda x: x[0], reverse=True)
+    combined = list()
+    for arr in sorted_arrs:
+        if len(arr) == 1:
+            combined.extend(arr)
+            continue
+
+        split_dict = dict()
+        for num in arr:
+            len_num = len(num)
+            if len_num not in split_dict:
+                split_dict[len_num] = list()
+            split_dict[len_num].append(num)
+
+        sorted_val_arrs = sorted(
+            split_dict.values(), key=lambda x: len(x[0]))
+        for val_arr in sorted_val_arrs:
+            combined.extend(sorted(val_arr, reverse=True))
+
+    return int(prefix.join(combined))
+
+
+# Tests
+assert get_largest([10, 7, 76, 415]) == 77641510