#include <stdio.h>
#include <string.h>
#define EM 300000
#define VM 50005
struct edge
{
v,w,next;
}e[EM];
int head[VM],ep;
void addedge(int cu,int cv,int cw)
{
cv;
cw;
head[cu];
ep;
}
int maxn (int a,int b)
{
> b?a:b;
}
void spfa (int n)
{
vis[VM],dis[VM],stack[EM];
(vis,0,sizeof(vis));
(dis,-1,sizeof(dis));
= 0;i <= n;i ++)
//
0;
1;
1;
n+2;
(top)
int u = stack[--top];
vis[u] = 0;
for (int i = head[u];i != -1;i = e[i].next)
{
int v = e[i].v;
if (dis[v] < dis[u] + e[i].w)
{
dis[v] = dis[u] + e[i].w;
if (!vis[v])
{
vis[v] = 1;
stack[top++] = v;
}
}
}
("%d\n",dis[n]);
}
int main ()
{
n,v1,v2,m,cost;
0;