From 2dae7ade5d21dc2560d763c40a549780a265202c Mon Sep 17 00:00:00 2001
From: oncsr <khj20006@naver.com>
Date: Wed, 1 Oct 2025 16:55:49 +0900
Subject: [PATCH] =?UTF-8?q?[20251001]=20BOJ=20/=20P5=20/=20=EC=A7=80?=
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 =?UTF-8?q?=20=EA=B6=8C=ED=98=81=EC=A4=80?=
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---
 ...30\354\263\220\355\235\230\353\237\254.md" | 37 +++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 "khj20006/202510/01 BOJ P5 \354\247\200\355\217\220\352\260\200 \353\204\230\354\263\220\355\235\230\353\237\254.md"

diff --git "a/khj20006/202510/01 BOJ P5 \354\247\200\355\217\220\352\260\200 \353\204\230\354\263\220\355\235\230\353\237\254.md" "b/khj20006/202510/01 BOJ P5 \354\247\200\355\217\220\352\260\200 \353\204\230\354\263\220\355\235\230\353\237\254.md"
new file mode 100644
index 00000000..97c75d02
--- /dev/null
+++ "b/khj20006/202510/01 BOJ P5 \354\247\200\355\217\220\352\260\200 \353\204\230\354\263\220\355\235\230\353\237\254.md"	
@@ -0,0 +1,37 @@
+```cpp
+#include <bits/stdc++.h>
+using namespace std;
+using ll = long long;
+
+int N, Q, LIMIT;
+ll w[262144]{}, l[524288]{}, r[524288]{}, x[524288]{};
+
+void init(int n) {
+    if(n >= LIMIT) return;
+    init(n*2); init(n*2+1);
+    l[n] = w[n] + max(l[n*2], r[n*2]);
+    r[n] = w[n] + max(l[n*2+1], r[n*2+1]);
+    x[n] = max({x[n*2], x[n*2+1], l[n] + r[n] - w[n]});
+}
+
+int main(){
+    cin.tie(0)->sync_with_stdio(0);
+
+    cin>>N;
+    for(int i=1;i<=N;i++) cin>>w[i];
+    LIMIT = N+1;
+    init(1);
+    cout<<x[1]<<'\n';
+    for(cin>>Q;Q--;) {
+        int i,d;
+        cin>>i>>d;
+        for(w[i]=d;i;i>>=1) {
+            l[i] = w[i] + max(l[i*2], r[i*2]);
+            r[i] = w[i] + max(l[i*2+1], r[i*2+1]);
+            x[i] = max({x[i*2], x[i*2+1], l[i] + r[i] - w[i]});
+        }
+        cout<<x[1]<<'\n';
+    }
+
+}
+```