arc123_d

1 files changed, 2 insertions, 0 deletions

diff --git a/atcoder.md b/atcoder.md
index 9007185..e6638c8 100644
--- a/atcoder.md
+++ b/atcoder.md
@@ -237,3 +237,5 @@
 - ~~arc116_e: Make sure you read the problem very carefully, especially if it seems too easy or you're stuck!~~
 
 - ~~arc117_d: Immediately reminds us of centroids/diameters, but don't get confused because this a diameters problem, make sure you read the conditions in the problem carefully as well~~
+
+- arc123_d: Do some test cases and there's an obvious greedy strategy; However, reading it closely, it's actually asking for the absolute value, so we should try all of the shifts; You can binary search or two-pointers, but the easiest way is to put all the shifts into an array and sort them, then go through the one by one