From a2b13f5471d76181c420384cb8e5a5e318300caf Mon Sep 17 00:00:00 2001
From: pgftvecou <1714774285@qq.com>
Date: Mon, 26 Jun 2023 01:24:34 +0800
Subject: [PATCH] ADD file via upload

---
 自行车.cpp | 52 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 自行车.cpp

diff --git a/自行车.cpp b/自行车.cpp
new file mode 100644
index 0000000..f656ae0
--- /dev/null
+++ b/自行车.cpp
@@ -0,0 +1,52 @@
+#include <vector>
+
+#include <stdio.h>
+#define INF 0x3f3f3f3f			//¶¨Òå¡Þ
+#define MAXV 101
+int A[MAXV][MAXV];			//ÁÚ½Ó¾ØÕó
+int n, m;
+int s, t;
+int dist[MAXV];
+void BellmanFord(int v)			//±´¶ûÂü-¸£ÌØËã·¨
+{
+	int i, k, u;
+	for (i = 0; i < n; i++)
+		dist[i] = A[v][i];		//¶Ôdist0[i]³õʼ»¯
+	for (k = 1; k < n; k++)			//´Ódist0[u]µÝÍƳödist2[u], ¡­,distn-1[u]Ñ­»·n-2´Î
+	{
+		for (u = 0; u < n; u++)		//ÐÞ¸ÄËùÓзǶ¥µãvµÄdist[]Öµ
+		{
+			if (u != v)
+			{
+				for (i = 0; i < n; i++)
+				{
+					if (A[i][u]<INF && dist[u]>dist[i] + A[i][u])
+						dist[u] = dist[i] + A[i][u];
+				}
+			}
+		}
+	}
+}
+int main()
+{
+	int i, j;
+	int a, b, l;
+	scanf("%d%d", &n, &m);		//ÊäÈën¡¢m
+	for (i = 0; i < n; i++)				//³õʼ»¯ÁÚ½Ó¾ØÕó
+		for (j = 0; j < n; j++)
+			if (i == j)
+				A[i][j] = 0;
+			else
+				A[i][j] = INF;
+	for (i = 0; i < m; i++)			//ÊäÈë±ß
+	{
+		scanf("%d%d%d", &a, &b, &l);
+		A[a][b] = -l;
+	}
+	scanf("%d%d", &s, &t);		//ÊäÈësºÍt
+	BellmanFord(s);				//²ÉÓÃBellmanFordËã·¨Çós³ö·¢µÄ×î¶Ì·¾¶
+	printf("%d\n", -dist[t]);		//Êä³ö½á¹û
+	return 1;
+}
+
+