From 1ca38e37c8dbaa7e0b9f49bb134bc03f8355d92c Mon Sep 17 00:00:00 2001
From: Ren Baoshuo <i@baoshuo.ren>
Date: Tue, 29 Jun 2021 19:09:48 +0800
Subject: [PATCH] =?UTF-8?q?P3742=20umi=E7=9A=84=E5=87=BD=E6=95=B0?=
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R52193557
---
 Luogu/problem/P3742/P3742.cpp | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 Luogu/problem/P3742/P3742.cpp

diff --git a/Luogu/problem/P3742/P3742.cpp b/Luogu/problem/P3742/P3742.cpp
new file mode 100644
index 00000000..ec33253e
--- /dev/null
+++ b/Luogu/problem/P3742/P3742.cpp
@@ -0,0 +1,18 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int main() {
+    int n;
+    string s1, s2, g;
+    cin >> n >> s1 >> s2;
+    for (int i = 0; i < n; i++) {
+        g.push_back(min(s1[i], s2[i]));
+        if (s1[i] < s2[i]) {
+            cout << -1 << endl;
+            return 0;
+        }
+    }
+    cout << g << endl;
+    return 0;
+}