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, 19 insertions, 0 deletions

diff --git a/users/wpcarro/scratch/facebook/moderate/find-pairs-for-sum.py b/users/wpcarro/scratch/facebook/moderate/find-pairs-for-sum.py
new file mode 100644
index 000000000000..69c2fc431296
--- /dev/null
+++ b/users/wpcarro/scratch/facebook/moderate/find-pairs-for-sum.py
@@ -0,0 +1,19 @@
+import random
+
+def find_pairs(xs, n):
+    """
+    Return all pairs of integers in `xs` that sum to `n`.
+    """
+    seeking = set()
+    result = set()
+    for x in xs:
+        if x in seeking:
+            result.add((n - x, x))
+        else:
+            seeking.add(n - x)
+    return result
+
+xs = [random.randint(1, 10) for _ in range(10)]
+n = random.randint(1, 10) + random.randint(1, 10)
+print("Seeking all pairs in {} for {}...".format(xs, n))
+print(find_pairs(xs, n))