adding python solution

inclusao-de-subintervalos/problem.json

@@ -11,10 +11,14 @@
         "grader": false,
         "subject": {
             "en_us": [
-                "set-cover-problem", "greedy", "sorting"
+                "set-cover-problem",
+                "greedy",
+                "sorting"
             ],
             "pt_br": [
-                "inclusao-de-subintervalos", "guloso", "ordenação"
+                "inclusao-de-subintervalos",
+                "guloso",
+                "ordenação"
             ],
             "es": [
                 ""
@@ -43,9 +47,16 @@
     },
     "solutions": {
         "main-ac": "ac.cpp",
-        "alternative-ac": ["caio.cpp"],
-        "wrong-answer": ["wa.cpp"],
-        "time-limit": ["TLE.cpp"],
+        "alternative-ac": [
+            "caio.cpp",
+            "saad.py"
+        ],
+        "wrong-answer": [
+            "wa.cpp"
+        ],
+        "time-limit": [
+            "TLE.cpp"
+        ],
         "time-limit-or-ac": [],
         "time-limit-or-memory-limit": [],
         "memory-limit": [],