From a88a53c97aa9a9741be6a72d66257b7c79ef4c33 Mon Sep 17 00:00:00 2001
From: Baoshuo <i@baoshuo.ren>
Date: Fri, 28 Oct 2022 19:56:00 +0800
Subject: [PATCH] =?UTF-8?q?P3376=20=E3=80=90=E6=A8=A1=E6=9D=BF=E3=80=91?=
 =?UTF-8?q?=E7=BD=91=E7=BB=9C=E6=9C=80=E5=A4=A7=E6=B5=81?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

https://www.luogu.com.cn/record/91932491
---
 Luogu/P3376/P3376.cpp        | 44 +++++++++++++++++++++++-------------
 Luogu/P3376/data/P3376_7.in  |  3 +++
 Luogu/P3376/data/P3376_7.out |  3 +++
 3 files changed, 34 insertions(+), 16 deletions(-)
 create mode 100644 Luogu/P3376/data/P3376_7.in
 create mode 100644 Luogu/P3376/data/P3376_7.out

diff --git a/Luogu/P3376/P3376.cpp b/Luogu/P3376/P3376.cpp
index a80ce228..3291408c 100644
--- a/Luogu/P3376/P3376.cpp
+++ b/Luogu/P3376/P3376.cpp
@@ -1,5 +1,5 @@
 #include <iostream>
-#include <cstring>
+#include <algorithm>
 #include <queue>
 
 using std::cin;
@@ -8,44 +8,45 @@ const char endl = '\n';
 
 const int N = 205,
           M = 5005;
+const int INF = 0x3f3f3f3f;
 
 int n, m, s, t, flow;
 long long ans;
-
-// Graph
-int idx, head[N], edge[M << 1], ver[M << 1], next[M << 1];
+int idx, head[N], ver[M << 1], edge[M << 1], next[M << 1];
+int d[N], cur[N];
 
 void add(int u, int v, int w) {
     next[idx] = head[u];
-    edge[idx] = w;
     ver[idx] = v;
+    edge[idx] = w;
     head[u] = idx++;
 }
 
-// Dinic
-int d[N], cur[N];
-
 bool bfs() {
-    memset(d, 0x00, sizeof(d));
+    std::fill_n(d, N, 0);
+
     std::queue<int> q;
-    d[s] = 1;
     q.push(s);
+    d[s] = 1;
     cur[s] = head[s];
 
     while (!q.empty()) {
         int u = q.front();
         q.pop();
+
         for (int i = head[u]; ~i; i = next[i]) {
             int v = ver[i],
                 w = edge[i];
+
             if (w && !d[v]) {
                 d[v] = d[u] + 1;
                 cur[v] = head[v];
                 if (v == t) return true;
-                q.push(v);
+                q.emplace(v);
             }
         }
     }
+
     return false;
 }
 
@@ -58,30 +59,41 @@ int dinic(int u, int limit) {
 
         int v = ver[i],
             w = edge[i];
+
         if (w && d[v] == d[u] + 1) {
-            int k = dinic(v, std::min(edge[i], limit - flow));
+            int k = dinic(v, std::min(w, limit - flow));
+
             if (!k) d[v] = 0;
+
             edge[i] -= k;
             edge[i ^ 1] += k;
             flow += k;
         }
     }
+
     return flow;
 }
 
 int main() {
     std::ios::sync_with_stdio(false);
-    memset(head, 0xff, sizeof(head));
+    cin.tie(nullptr);
+
+    std::fill_n(head, N, -1);
+
     cin >> n >> m >> s >> t;
-    for (int i = 1; i <= m; i++) {
-        int u, v, w;
+
+    for (int i = 1, u, v, w; i <= m; i++) {
         cin >> u >> v >> w;
+
         add(u, v, w);
         add(v, u, 0);
     }
+
     while (bfs()) {
-        while (flow = dinic(s, 0x3f3f3f3f)) ans += flow;
+        while (flow = dinic(s, INF)) ans += flow;
     }
+
     cout << ans << endl;
+
     return 0;
 }
diff --git a/Luogu/P3376/data/P3376_7.in b/Luogu/P3376/data/P3376_7.in
new file mode 100644
index 00000000..fde9e15a
--- /dev/null
+++ b/Luogu/P3376/data/P3376_7.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:9c2edbc19f4a198ad327a229949eaed355cd613cd5fa743cc3caec02f2bfa528
+size 24510
diff --git a/Luogu/P3376/data/P3376_7.out b/Luogu/P3376/data/P3376_7.out
new file mode 100644
index 00000000..b24f6e50
--- /dev/null
+++ b/Luogu/P3376/data/P3376_7.out
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:711705b8d16758ada9c9de622d69b10052bd7258acb69fa33c6bed20855083f4
+size 12