subtree(users/wpcarro): docking briefcase at '24f5a642' r/3226

git-subtree-dir: users/wpcarro
git-subtree-mainline: 464bbcb15c09813172c79820bcf526bb10cf4208
git-subtree-split: 24f5a642af3aa1627bbff977f0a101907a02c69f
Change-Id: I6105b3762b79126b3488359c95978cadb3efa789

1 files changed, 17 insertions, 0 deletions

diff --git a/users/wpcarro/scratch/facebook/find-unique-int-among-duplicates.py b/users/wpcarro/scratch/facebook/find-unique-int-among-duplicates.py
new file mode 100644
index 000000000000..56032aa05c8c
--- /dev/null
+++ b/users/wpcarro/scratch/facebook/find-unique-int-among-duplicates.py
@@ -0,0 +1,17 @@
+import random
+
+def find_duplicate(xs):
+    mini, maxi, acc = xs[0], xs[0], xs[0]
+    for i in range(1, len(xs)):
+        mini = min(mini, xs[i])
+        maxi = max(maxi, xs[i])
+        acc = acc ^ xs[i]
+    mask = mini
+    for i in range(mini + 1, maxi + 1):
+        mask = mask ^ i
+    return mask ^ acc
+
+xs = [5, 3, 4, 1, 5, 2]
+print(xs)
+result = find_duplicate(xs)
+print(result)