delete pics to save space

1.1073.cpp

@@ -0,0 +1,35 @@
+#include<cstdio>
+#include<cstring>
+#include<vector>
+#include<algorithm>
+using namespace std;
+const int oo=0x3f3f3f3f;
+const int maxn=100005;
+vector<int> G[maxn];
+int n,m,f[maxn],mi[maxn],a[maxn];
+void dfs(int u,int mina,int p)
+{
+	int flag=1; 
+	mina=min(a[u],mina);
+	if(mi[u]>mina) mi[u]=mina,flag=0;
+	int maxx=max(f[p],a[u]-mina);
+	if(f[u]<maxx) { f[u]=maxx; flag=0; }
+	if(flag) return;
+	for(int i=0;i<G[u].size();i++) dfs(G[u][i],mina,u);
+}
+int main()
+{
+	scanf("%d%d",&n,&m);
+	for(int i=1;i<=n;i++) scanf("%d",&a[i]);
+	for(int i=1;i<=m;i++)
+	{
+		int u,v,md;
+		scanf("%d%d%d",&u,&v,&md);
+		G[u].push_back(v);
+		if(md==2) G[v].push_back(u);
+	}
+	memset(mi,oo,sizeof(mi));
+	dfs(1,oo,0);
+	printf("%d\n",f[n]);
+	return 0;
+}