From 7960997ed26e2631a5015104eb841864eb33bfef Mon Sep 17 00:00:00 2001
From: Justin Worthe <justin@worthe-it.co.za>
Date: Sat, 8 Sep 2018 13:17:27 +0200
Subject: Optimized away unnecessary sum

---
 src/strategy/monte_carlo_tree.rs | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

(limited to 'src/strategy')

diff --git a/src/strategy/monte_carlo_tree.rs b/src/strategy/monte_carlo_tree.rs
index 2d27b62..24b2088 100644
--- a/src/strategy/monte_carlo_tree.rs
+++ b/src/strategy/monte_carlo_tree.rs
@@ -70,8 +70,7 @@ impl NodeStats {
     fn node_with_highest_ucb<'a>(&'a mut self) -> &'a mut (Command, NodeStats) {
         debug_assert!(self.unexplored.is_empty());
         debug_assert!(self.explored.len() > 0);
-        let total_attempts = self.explored.iter().map(|(_, n)| n.attempts).sum::<f32>();
-        let sqrt_n = total_attempts.sqrt();
+        let sqrt_n = self.attempts.sqrt();
 
         let mut max_position = 0;
         let mut max_value = self.explored[0].1.ucb(sqrt_n);
-- 
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