From f110cdee18a6662d03d9b0ed7995f125f0dc5e31 Mon Sep 17 00:00:00 2001
From: Baoshuo <i@baoshuo.ren>
Date: Sun, 4 Aug 2024 12:58:14 +0800
Subject: [PATCH] =?UTF-8?q?860.=20=E6=9F=93=E8=89=B2=E6=B3=95=E5=88=A4?=
 =?UTF-8?q?=E5=AE=9A=E4=BA=8C=E5=88=86=E5=9B=BE?=
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https://www.acwing.com/problem/content/submission/code_detail/36295038/
---
 AcWing/860/860.cpp     | 59 ++++++++++++++++++++++++++++++++++++++++++
 AcWing/860/data/17.ans |  3 +++
 AcWing/860/data/17.in  |  3 +++
 3 files changed, 65 insertions(+)
 create mode 100644 AcWing/860/860.cpp
 create mode 100644 AcWing/860/data/17.ans
 create mode 100644 AcWing/860/data/17.in

diff --git a/AcWing/860/860.cpp b/AcWing/860/860.cpp
new file mode 100644
index 00000000..d6156e2d
--- /dev/null
+++ b/AcWing/860/860.cpp
@@ -0,0 +1,59 @@
+#include <iostream>
+#include <algorithm>
+#include <iterator>
+#include <vector>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int N = 1e5 + 5;
+
+int n, m;
+std::vector<int> g[N];
+int color[N];
+
+bool dfs(int u, int c) {
+    color[u] = c;
+
+    for (int v : g[u]) {
+        if (~color[v]) {                      // 如果已经染色
+            if (color[v] == c) return false;  // 同色，矛盾
+        } else {
+            if (!dfs(v, c ^ 1)) return false;
+        }
+    }
+
+    return true;
+}
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    std::fill(std::begin(color), std::end(color), -1);
+
+    cin >> n >> m;
+
+    for (int i = 1, u, v; i <= m; i++) {
+        cin >> u >> v;
+
+        g[u].push_back(v);
+        g[v].push_back(u);
+    }
+
+    // 图可能不连通
+    for (int i = 1; i <= n; i++) {
+        if (!~color[i]) {  // 如果没有染色
+            if (!dfs(i, 0)) {
+                cout << "No" << endl;
+
+                exit(0);
+            }
+        }
+    }
+
+    cout << "Yes" << endl;
+
+    return 0;
+}
diff --git a/AcWing/860/data/17.ans b/AcWing/860/data/17.ans
new file mode 100644
index 00000000..eeec6523
--- /dev/null
+++ b/AcWing/860/data/17.ans
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:31375587f8bedb1f33f6eca3d8cee94ab70845a6dd1a7c7eeb929f4aa7dc10ab
+size 3
diff --git a/AcWing/860/data/17.in b/AcWing/860/data/17.in
new file mode 100644
index 00000000..05d87180
--- /dev/null
+++ b/AcWing/860/data/17.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:b319661c0a34865d1aa53eb98d8979074183ab34c81f889c6fa049f79428dbe7
+size 32