From b5f87613c92a1d2d9df0393707c182a916f471d2 Mon Sep 17 00:00:00 2001
From: Baoshuo <i@baoshuo.ren>
Date: Thu, 4 Aug 2022 20:36:54 +0800
Subject: [PATCH] =?UTF-8?q?#2594.=20=E3=80=8CNOIP2010=E3=80=8D=E5=85=B3?=
 =?UTF-8?q?=E6=8A=BC=E7=BD=AA=E7=8A=AF?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

https://loj.ac/s/1541617
---
 LibreOJ/2594/2594.cpp          | 75 ++++++++++++++++++++++++++++++++++
 LibreOJ/2594/data/prison1.ans  |  3 ++
 LibreOJ/2594/data/prison1.in   |  3 ++
 LibreOJ/2594/data/prison10.ans |  3 ++
 LibreOJ/2594/data/prison10.in  |  3 ++
 LibreOJ/2594/data/prison2.ans  |  3 ++
 LibreOJ/2594/data/prison2.in   |  3 ++
 LibreOJ/2594/data/prison3.ans  |  3 ++
 LibreOJ/2594/data/prison3.in   |  3 ++
 LibreOJ/2594/data/prison4.ans  |  3 ++
 LibreOJ/2594/data/prison4.in   |  3 ++
 LibreOJ/2594/data/prison5.ans  |  3 ++
 LibreOJ/2594/data/prison5.in   |  3 ++
 LibreOJ/2594/data/prison6.ans  |  3 ++
 LibreOJ/2594/data/prison6.in   |  3 ++
 LibreOJ/2594/data/prison7.ans  |  3 ++
 LibreOJ/2594/data/prison7.in   |  3 ++
 LibreOJ/2594/data/prison8.ans  |  3 ++
 LibreOJ/2594/data/prison8.in   |  3 ++
 LibreOJ/2594/data/prison9.ans  |  3 ++
 LibreOJ/2594/data/prison9.in   |  3 ++
 21 files changed, 135 insertions(+)
 create mode 100644 LibreOJ/2594/2594.cpp
 create mode 100644 LibreOJ/2594/data/prison1.ans
 create mode 100644 LibreOJ/2594/data/prison1.in
 create mode 100644 LibreOJ/2594/data/prison10.ans
 create mode 100644 LibreOJ/2594/data/prison10.in
 create mode 100644 LibreOJ/2594/data/prison2.ans
 create mode 100644 LibreOJ/2594/data/prison2.in
 create mode 100644 LibreOJ/2594/data/prison3.ans
 create mode 100644 LibreOJ/2594/data/prison3.in
 create mode 100644 LibreOJ/2594/data/prison4.ans
 create mode 100644 LibreOJ/2594/data/prison4.in
 create mode 100644 LibreOJ/2594/data/prison5.ans
 create mode 100644 LibreOJ/2594/data/prison5.in
 create mode 100644 LibreOJ/2594/data/prison6.ans
 create mode 100644 LibreOJ/2594/data/prison6.in
 create mode 100644 LibreOJ/2594/data/prison7.ans
 create mode 100644 LibreOJ/2594/data/prison7.in
 create mode 100644 LibreOJ/2594/data/prison8.ans
 create mode 100644 LibreOJ/2594/data/prison8.in
 create mode 100644 LibreOJ/2594/data/prison9.ans
 create mode 100644 LibreOJ/2594/data/prison9.in

diff --git a/LibreOJ/2594/2594.cpp b/LibreOJ/2594/2594.cpp
new file mode 100644
index 00000000..6e57cbf9
--- /dev/null
+++ b/LibreOJ/2594/2594.cpp
@@ -0,0 +1,75 @@
+#include <iostream>
+#include <array>
+#include <utility>
+#include <vector>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int N = 20005;
+
+int n, m;
+std::array<int, N> color;
+std::array<std::vector<std::pair<int, int>>, N> g;
+
+bool dfs(int u, int color, int limit) {
+    ::color[u] = color;
+
+    for (auto e : g[u]) {
+        int v = e.first,
+            w = e.second;
+
+        if (w <= limit) continue;
+        if (::color[v]) {
+            if (::color[v] == color) return false;
+        } else if (!dfs(v, 3 - color, limit)) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+bool check(int limit) {
+    std::fill(color.begin(), color.end(), 0);
+
+    for (int i = 1; i <= n; i++) {
+        if (!color[i]) {
+            if (!dfs(i, 1, limit)) return false;
+        }
+    }
+
+    return true;
+}
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cin >> n >> m;
+
+    for (int i = 1, u, v, w; i <= m; i++) {
+        cin >> u >> v >> w;
+
+        g[u].emplace_back(v, w);
+        g[v].emplace_back(u, w);
+    }
+
+    int l = 0, r = 1e9, ans = 0;
+
+    while (l <= r) {
+        int mid = (l + r) >> 1;
+
+        if (check(mid)) {
+            ans = mid;
+            r = mid - 1;
+        } else {
+            l = mid + 1;
+        }
+    }
+
+    cout << ans << endl;
+
+    return 0;
+}
diff --git a/LibreOJ/2594/data/prison1.ans b/LibreOJ/2594/data/prison1.ans
new file mode 100644
index 00000000..804fcc90
--- /dev/null
+++ b/LibreOJ/2594/data/prison1.ans
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:9a271f2a916b0b6ee6cecb2426f0b3206ef074578be55d9bc94f6f3fe3ab86aa
+size 2
diff --git a/LibreOJ/2594/data/prison1.in b/LibreOJ/2594/data/prison1.in
new file mode 100644
index 00000000..0e8faba0
--- /dev/null
+++ b/LibreOJ/2594/data/prison1.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:b4360a4896fbd2f8c6641d62075b181a5df54a4fac7c739a6b7ff7d609453235
+size 14
diff --git a/LibreOJ/2594/data/prison10.ans b/LibreOJ/2594/data/prison10.ans
new file mode 100644
index 00000000..d915cdd3
--- /dev/null
+++ b/LibreOJ/2594/data/prison10.ans
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:b256953a3441ece9ea38748f321f46aca9997699b498ef24f43d0fae8c8306c3
+size 6
diff --git a/LibreOJ/2594/data/prison10.in b/LibreOJ/2594/data/prison10.in
new file mode 100644
index 00000000..14e0ca3f
--- /dev/null
+++ b/LibreOJ/2594/data/prison10.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:71369594a6ac740182f0afd1154134dff55430dbba0f1f4c48959a6b565e8d72
+size 1630814
diff --git a/LibreOJ/2594/data/prison2.ans b/LibreOJ/2594/data/prison2.ans
new file mode 100644
index 00000000..2f4d73e9
--- /dev/null
+++ b/LibreOJ/2594/data/prison2.ans
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:5233b8e366b04acdf6de5ac2f15bb5ca3f88693a10c35b564e0f4ee85f76a200
+size 6
diff --git a/LibreOJ/2594/data/prison2.in b/LibreOJ/2594/data/prison2.in
new file mode 100644
index 00000000..317808ab
--- /dev/null
+++ b/LibreOJ/2594/data/prison2.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:a03eb0a56d28035db3c6aff4ecd1552914fd5c52ebccd8297f4e0a002c844517
+size 306
diff --git a/LibreOJ/2594/data/prison3.ans b/LibreOJ/2594/data/prison3.ans
new file mode 100644
index 00000000..1faab98f
--- /dev/null
+++ b/LibreOJ/2594/data/prison3.ans
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:f788e6da08461109fa6b4f4771788ee6bd2e17d4554c583d5ba72614d4ae5bc6
+size 6
diff --git a/LibreOJ/2594/data/prison3.in b/LibreOJ/2594/data/prison3.in
new file mode 100644
index 00000000..0e590abe
--- /dev/null
+++ b/LibreOJ/2594/data/prison3.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:0db7ad8f1d6036a60e84e5a2f6afc188c5f1420d6e526039975c6fdfa2928aef
+size 632
diff --git a/LibreOJ/2594/data/prison4.ans b/LibreOJ/2594/data/prison4.ans
new file mode 100644
index 00000000..3c00ec04
--- /dev/null
+++ b/LibreOJ/2594/data/prison4.ans
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:9deba0c973f7997389b4e4bcd70f0ca31b7d2674ad34575dcd03c728b0fc5ea9
+size 6
diff --git a/LibreOJ/2594/data/prison4.in b/LibreOJ/2594/data/prison4.in
new file mode 100644
index 00000000..0758437f
--- /dev/null
+++ b/LibreOJ/2594/data/prison4.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:170994668d9cbfe0f33791585a3bb9304e9c879983555dbb8b43e89739d460c3
+size 34502
diff --git a/LibreOJ/2594/data/prison5.ans b/LibreOJ/2594/data/prison5.ans
new file mode 100644
index 00000000..c728d61f
--- /dev/null
+++ b/LibreOJ/2594/data/prison5.ans
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:afa500c35adfaa6f425193b6e131eb68c02a5937e385caf1985f38e6a452ddc0
+size 6
diff --git a/LibreOJ/2594/data/prison5.in b/LibreOJ/2594/data/prison5.in
new file mode 100644
index 00000000..6408ff64
--- /dev/null
+++ b/LibreOJ/2594/data/prison5.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:0be826b23da39b86b447789b23c79613743679c36c486cddc610ea004f1f5932
+size 13139
diff --git a/LibreOJ/2594/data/prison6.ans b/LibreOJ/2594/data/prison6.ans
new file mode 100644
index 00000000..f9cee25e
--- /dev/null
+++ b/LibreOJ/2594/data/prison6.ans
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:96dcec5d6d770e9477d3d39af3e89c421d246b6d0e448f969e9cb611a59824cc
+size 6
diff --git a/LibreOJ/2594/data/prison6.in b/LibreOJ/2594/data/prison6.in
new file mode 100644
index 00000000..2ffab688
--- /dev/null
+++ b/LibreOJ/2594/data/prison6.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:870582d4edf4b460389fe68510437bc6af650c412af882aef1316390d5eda5f1
+size 134325
diff --git a/LibreOJ/2594/data/prison7.ans b/LibreOJ/2594/data/prison7.ans
new file mode 100644
index 00000000..546cc8c2
--- /dev/null
+++ b/LibreOJ/2594/data/prison7.ans
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:b04073667b95e73f45745b6b1436f29f62c32993836a53e0de9e9c185cf9345a
+size 6
diff --git a/LibreOJ/2594/data/prison7.in b/LibreOJ/2594/data/prison7.in
new file mode 100644
index 00000000..34f5cef3
--- /dev/null
+++ b/LibreOJ/2594/data/prison7.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:1d5185eb6b5e3084a8b8664c0e802773570c59c9fead50af8e34fa66c6ecbb27
+size 726176
diff --git a/LibreOJ/2594/data/prison8.ans b/LibreOJ/2594/data/prison8.ans
new file mode 100644
index 00000000..ebe35e45
--- /dev/null
+++ b/LibreOJ/2594/data/prison8.ans
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:84792b6bee8f0f6c2fcc1ce5442bc50d19c3d0265f849d18e7486df760a7030b
+size 6
diff --git a/LibreOJ/2594/data/prison8.in b/LibreOJ/2594/data/prison8.in
new file mode 100644
index 00000000..76e76460
--- /dev/null
+++ b/LibreOJ/2594/data/prison8.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
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+size 759195
diff --git a/LibreOJ/2594/data/prison9.ans b/LibreOJ/2594/data/prison9.ans
new file mode 100644
index 00000000..4912515b
--- /dev/null
+++ b/LibreOJ/2594/data/prison9.ans
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
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+size 6
diff --git a/LibreOJ/2594/data/prison9.in b/LibreOJ/2594/data/prison9.in
new file mode 100644
index 00000000..61bd4819
--- /dev/null
+++ b/LibreOJ/2594/data/prison9.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:19bbf50ebff646c70cf41cd0fac3edb6b7d7fc3f8d4bebcc5fd89296c8a9a148
+size 1538879