From ca73bb7c700b58714b17a154dd2c082a702a440f Mon Sep 17 00:00:00 2001
From: Baoshuo <i@baoshuo.ren>
Date: Sun, 21 Aug 2022 09:10:12 +0800
Subject: [PATCH] =?UTF-8?q?#965.=20[=E9=9B=85=E7=A4=BC20191012]=E4=BA=A4?=
 =?UTF-8?q?=E9=94=99=E7=9A=84=E5=AD=97=E7=AC=A6=E4=B8=B2=EF=BC=88string?=
 =?UTF-8?q?=EF=BC=89?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

https://sjzezoj.com/submission/55115
---
 S2OJ/965/965.cpp           | 69 ++++++++++++++++++++++++++++++++++++++
 S2OJ/965/data/problem.conf |  3 ++
 S2OJ/965/data/string1.in   |  3 ++
 S2OJ/965/data/string1.out  |  3 ++
 S2OJ/965/data/string10.in  |  3 ++
 S2OJ/965/data/string10.out |  3 ++
 S2OJ/965/data/string11.in  |  3 ++
 S2OJ/965/data/string11.out |  3 ++
 S2OJ/965/data/string12.in  |  3 ++
 S2OJ/965/data/string12.out |  3 ++
 S2OJ/965/data/string13.in  |  3 ++
 S2OJ/965/data/string13.out |  3 ++
 S2OJ/965/data/string14.in  |  3 ++
 S2OJ/965/data/string14.out |  3 ++
 S2OJ/965/data/string15.in  |  3 ++
 S2OJ/965/data/string15.out |  3 ++
 S2OJ/965/data/string16.in  |  3 ++
 S2OJ/965/data/string16.out |  3 ++
 S2OJ/965/data/string17.in  |  3 ++
 S2OJ/965/data/string17.out |  3 ++
 S2OJ/965/data/string18.in  |  3 ++
 S2OJ/965/data/string18.out |  3 ++
 S2OJ/965/data/string19.in  |  3 ++
 S2OJ/965/data/string19.out |  3 ++
 S2OJ/965/data/string2.in   |  3 ++
 S2OJ/965/data/string2.out  |  3 ++
 S2OJ/965/data/string20.in  |  3 ++
 S2OJ/965/data/string20.out |  3 ++
 S2OJ/965/data/string21.in  |  3 ++
 S2OJ/965/data/string21.out |  3 ++
 S2OJ/965/data/string22.in  |  3 ++
 S2OJ/965/data/string22.out |  3 ++
 S2OJ/965/data/string23.in  |  3 ++
 S2OJ/965/data/string23.out |  3 ++
 S2OJ/965/data/string24.in  |  3 ++
 S2OJ/965/data/string24.out |  3 ++
 S2OJ/965/data/string25.in  |  3 ++
 S2OJ/965/data/string25.out |  3 ++
 S2OJ/965/data/string3.in   |  3 ++
 S2OJ/965/data/string3.out  |  3 ++
 S2OJ/965/data/string4.in   |  3 ++
 S2OJ/965/data/string4.out  |  3 ++
 S2OJ/965/data/string5.in   |  3 ++
 S2OJ/965/data/string5.out  |  3 ++
 S2OJ/965/data/string6.in   |  3 ++
 S2OJ/965/data/string6.out  |  3 ++
 S2OJ/965/data/string7.in   |  3 ++
 S2OJ/965/data/string7.out  |  3 ++
 S2OJ/965/data/string8.in   |  3 ++
 S2OJ/965/data/string8.out  |  3 ++
 S2OJ/965/data/string9.in   |  3 ++
 S2OJ/965/data/string9.out  |  3 ++
 52 files changed, 222 insertions(+)
 create mode 100644 S2OJ/965/965.cpp
 create mode 100644 S2OJ/965/data/problem.conf
 create mode 100644 S2OJ/965/data/string1.in
 create mode 100644 S2OJ/965/data/string1.out
 create mode 100644 S2OJ/965/data/string10.in
 create mode 100644 S2OJ/965/data/string10.out
 create mode 100644 S2OJ/965/data/string11.in
 create mode 100644 S2OJ/965/data/string11.out
 create mode 100644 S2OJ/965/data/string12.in
 create mode 100644 S2OJ/965/data/string12.out
 create mode 100644 S2OJ/965/data/string13.in
 create mode 100644 S2OJ/965/data/string13.out
 create mode 100644 S2OJ/965/data/string14.in
 create mode 100644 S2OJ/965/data/string14.out
 create mode 100644 S2OJ/965/data/string15.in
 create mode 100644 S2OJ/965/data/string15.out
 create mode 100644 S2OJ/965/data/string16.in
 create mode 100644 S2OJ/965/data/string16.out
 create mode 100644 S2OJ/965/data/string17.in
 create mode 100644 S2OJ/965/data/string17.out
 create mode 100644 S2OJ/965/data/string18.in
 create mode 100644 S2OJ/965/data/string18.out
 create mode 100644 S2OJ/965/data/string19.in
 create mode 100644 S2OJ/965/data/string19.out
 create mode 100644 S2OJ/965/data/string2.in
 create mode 100644 S2OJ/965/data/string2.out
 create mode 100644 S2OJ/965/data/string20.in
 create mode 100644 S2OJ/965/data/string20.out
 create mode 100644 S2OJ/965/data/string21.in
 create mode 100644 S2OJ/965/data/string21.out
 create mode 100644 S2OJ/965/data/string22.in
 create mode 100644 S2OJ/965/data/string22.out
 create mode 100644 S2OJ/965/data/string23.in
 create mode 100644 S2OJ/965/data/string23.out
 create mode 100644 S2OJ/965/data/string24.in
 create mode 100644 S2OJ/965/data/string24.out
 create mode 100644 S2OJ/965/data/string25.in
 create mode 100644 S2OJ/965/data/string25.out
 create mode 100644 S2OJ/965/data/string3.in
 create mode 100644 S2OJ/965/data/string3.out
 create mode 100644 S2OJ/965/data/string4.in
 create mode 100644 S2OJ/965/data/string4.out
 create mode 100644 S2OJ/965/data/string5.in
 create mode 100644 S2OJ/965/data/string5.out
 create mode 100644 S2OJ/965/data/string6.in
 create mode 100644 S2OJ/965/data/string6.out
 create mode 100644 S2OJ/965/data/string7.in
 create mode 100644 S2OJ/965/data/string7.out
 create mode 100644 S2OJ/965/data/string8.in
 create mode 100644 S2OJ/965/data/string8.out
 create mode 100644 S2OJ/965/data/string9.in
 create mode 100644 S2OJ/965/data/string9.out

diff --git a/S2OJ/965/965.cpp b/S2OJ/965/965.cpp
new file mode 100644
index 00000000..ad115c68
--- /dev/null
+++ b/S2OJ/965/965.cpp
@@ -0,0 +1,69 @@
+#include <iostream>
+#include <string>
+#include <unordered_map>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int N = (18 << 1) + 5;
+
+int n;
+long long ans;
+bool vis[N];
+std::string s;
+std::unordered_map<std::string, int> map;
+
+void dfs1(int x) {
+    if (x == n + 1) {
+        std::string s1, s2;
+
+        for (int i = 1; i <= n; i++) {
+            (vis[i] ? s2 : s1).push_back(s[i]);
+        }
+
+        map[s1 + ' ' + s2]++;
+
+        return;
+    }
+
+    dfs1(x + 1);
+    vis[x] = true;
+    dfs1(x + 1);
+    vis[x] = false;
+}
+
+void dfs2(int x) {
+    if (x == n * 2 + 1) {
+        std::string s1, s2;
+
+        for (int i = n + n; i > n; i--) {
+            (vis[i] ? s2 : s1).push_back(s[i]);
+        }
+
+        ans += map[s1 + ' ' + s2];
+
+        return;
+    }
+
+    dfs2(x + 1);
+    vis[x] = true;
+    dfs2(x + 1);
+    vis[x] = false;
+}
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cin >> n >> s;
+
+    s = ' ' + s;
+
+    dfs1(1);
+    dfs2(n + 1);
+
+    cout << (ans >> 1) << endl;
+
+    return 0;
+}
diff --git a/S2OJ/965/data/problem.conf b/S2OJ/965/data/problem.conf
new file mode 100644
index 00000000..7f39841f
--- /dev/null
+++ b/S2OJ/965/data/problem.conf
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:5128ceb5ac094243d7468331843200823c4db340717d5d36821304674c67a9ad
+size 212
diff --git a/S2OJ/965/data/string1.in b/S2OJ/965/data/string1.in
new file mode 100644
index 00000000..dca697d9
--- /dev/null
+++ b/S2OJ/965/data/string1.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:d7c06942bedff289f2d926a72a5016ac97ccedb7c4c4cb35d75ba4e3ddd93c52
+size 11
diff --git a/S2OJ/965/data/string1.out b/S2OJ/965/data/string1.out
new file mode 100644
index 00000000..06d04c2c
--- /dev/null
+++ b/S2OJ/965/data/string1.out
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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--- /dev/null
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new file mode 100644
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--- /dev/null
+++ b/S2OJ/965/data/string12.out
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new file mode 100644
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