BZOJ 3573 米特运输

语文题。。。

原来除了hash还可以取对数啊orz

#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
#include<queue>
#include<cmath>
#include<cstdlib>
#define maxv 500500
#define maxe 1000500
using namespace std;
int n,val[maxv],son[maxv],x,y,g[maxv],nume=0,fath[maxv],ret,ans=0;
double r[maxv],stack[maxv],mx;
queue <int> q;
struct edge
{
    int v,nxt;
}e[maxe];
void addedge(int u,int v)
{
    e[++nume].v=v;
    e[nume].nxt=g[u];
    g[u]=nume;
}
void bfs()
{
    while (!q.empty()) q.pop();
    q.push(1);r[1]=0;
    while (!q.empty())
    {
        int head=q.front();q.pop();son[head]=0;
        for (int i=g[head];i;i=e[i].nxt)
        {
            int v=e[i].v;
            if (v!=fath[head])
            {
                fath[v]=head;
                son[head]++;
                q.push(v);
            }
        }
        for (int i=g[head];i;i=e[i].nxt)
        {
            int v=e[i].v;
            if (v!=fath[head])
                r[v]=r[head]+log(son[head]);
        }
    }
}
int main()
{
    scanf("%d",&n);
    for (int i=1;i<=n;i++)
        scanf("%d",&val[i]);
    for (int i=1;i<=n-1;i++)
    {
        scanf("%d%d",&x,&y);
        addedge(x,y);
        addedge(y,x);
    }
    bfs();
    for (int i=1;i<=n;i++)
        stack[i]=r[i]+log(val[i]);
    sort(stack+1,stack+n+1);
    ret=1;
    for (int i=2;i<=n+1;i++)
    {
        if (fabs(stack[i-1]-stack[i])<1e-5)
            ret++;
        else {ans=max(ans,ret);ret=1;}
    }
    printf("%d
",n-ans);
    return 0;
}