From acccd2fd72100ecc4e8aa8429cca69b852ef0d96 Mon Sep 17 00:00:00 2001
From: Ren Baoshuo <i@baoshuo.ren>
Date: Tue, 24 Nov 2020 21:28:41 +0800
Subject: [PATCH] =?UTF-8?q?P1020=20=E5=AF=BC=E5=BC=B9=E6=8B=A6=E6=88=AA?=
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R42449521
---
 problem/P1020/P1020.cpp | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 problem/P1020/P1020.cpp

diff --git a/problem/P1020/P1020.cpp b/problem/P1020/P1020.cpp
new file mode 100644
index 00000000..9e104f54
--- /dev/null
+++ b/problem/P1020/P1020.cpp
@@ -0,0 +1,29 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int n, l1, l2, a[100005], d1[100005], d2[100005];
+
+int main() {
+    while (cin >> a[++n]);
+    n--;
+    d1[++l1] = d2[++l2] = a[1];
+    for (int i = 2; i <= n; i++) {
+        if (d1[l1] >= a[i]) {
+            d1[++l1] = a[i];
+        }
+        else {
+            int* it = upper_bound(d1 + 1, d1 + 1 + l1, a[i], greater<int>());
+            *it = a[i];
+        }
+        if (d2[l2] < a[i]) {
+            d2[++l2] = a[i];
+        }
+        else {
+            int* it = lower_bound(d2 + 1, d2 + 1 + l2, a[i], less<int>());
+            *it = a[i];
+        }
+    }
+    cout << l1 << endl << l2 << endl;
+    return 0;
+}