Add kattis prob set in python3

kattis/set/solution.py

@@ -0,0 +1,26 @@
+def valid3(a, b, c):
+    same = 0
+    diff = 0
+    for i in range(4):
+        if a[i] == b[i] and a[i] == c[i]:
+            same += 1
+        if a[i] != b[i] and a[i] != c[i] and b[i] != c[i]:
+            diff += 1
+    return same + diff == 4
+
+cards = []
+for i in range(4):
+    s = input().split()
+    for c in s:
+        cards.append(c)
+
+n = 0
+for i in range(10):
+    for j in range(i+1, 11):
+        for k in range(j+1, 12):
+            if valid3(cards[i], cards[j], cards[k]):
+                print(i+1, j+1, k+1)
+                n += 1
+
+if n == 0:
+    print('no sets')