From 79ef71926c7f43b898b253c13079ef0ffe26f01e Mon Sep 17 00:00:00 2001
From: fmkiotheka <fmkiotheka@inf.ufpr.br>
Date: Fri, 20 Jan 2023 01:06:20 -0300
Subject: [PATCH] =?UTF-8?q?Adiciona=20busca=20bin=C3=A1ria=20na=20=C3=A1rv?=
=?UTF-8?q?ore=20de=20Fenwick?=
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---
fontes/fenwick-tree.h | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/fontes/fenwick-tree.h b/fontes/fenwick-tree.h
index bebaeef..5b11196 100644
--- a/fontes/fenwick-tree.h
+++ b/fontes/fenwick-tree.h
@@ -18,3 +18,17 @@ void add_inclusive(int a, int b, ll d) {
add(a, d);
add(b + 1, -d);
}
+
+int lower_bound(ll t) {
+ ll sum = 0; int pos = 0;
+ for (int p = log2(N); p >= 0; p--) {
+ if (
+ pos + (1 << p) < N
+ && sum + bit[pos + (1 << p)] < t
+ ) {
+ sum += bit[pos + (1 << p)];
+ pos += (1 << p);
+ }
+ }
+ return pos;
+}
--
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