From f2a72b8e2d9e11200759980831ed0196840d902c Mon Sep 17 00:00:00 2001
From: Ren Baoshuo <i@baoshuo.ren>
Date: Wed, 30 Jun 2021 19:33:34 +0800
Subject: [PATCH] =?UTF-8?q?843.=20n=E7=9A=87=E5=90=8E=E9=97=AE=E9=A2=98?=
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https://www.acwing.com/problem/content/submission/code_detail/6188239/
---
 AcWing/843/843.cpp | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 AcWing/843/843.cpp

diff --git a/AcWing/843/843.cpp b/AcWing/843/843.cpp
new file mode 100644
index 00000000..22cf4740
--- /dev/null
+++ b/AcWing/843/843.cpp
@@ -0,0 +1,37 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int n;
+bool col[20], dg[20], udg[20];
+char g[20][20];
+
+void dfs(int u) {
+    if (u == n) {
+        for (int i = 0; i < n; i++) {
+            cout << g[i] << endl;
+        }
+        cout << endl;
+        return;
+    }
+    for (int i = 0; i < n; i++) {
+        if (!col[i] && !dg[u + i] && !udg[n - u + i]) {
+            g[u][i] = 'Q';
+            col[i] = dg[u + i] = udg[n - u + i] = true;
+            dfs(u + 1);
+            col[i] = dg[u + i] = udg[n - u + i] = false;
+            g[u][i] = '.';
+        }
+    }
+}
+
+int main() {
+    cin >> n;
+    for(int i = 0 ; i < n ; i++) {
+        for(int j = 0 ; j < n ; j++) {
+            g[i][j] = '.';
+        }
+    }
+    dfs(0);
+    return 0;
+}