bzoj1006神奇的国度

Posted 2020-10-14 探险家Mr.H

OrzCDQ您太强辣

#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<algorithm>
#include<cstring>
#define inf 0x7fffffff
#define ll long long
using namespace std;
inline ll read()
{
    ll x=0,f=1;char ch=getchar();
    while(ch>‘9‘||ch<‘0‘){if(ch==‘-‘)f=-1;ch=getchar();}
    while(ch>=‘0‘&&ch<=‘9‘){x=x*10+ch-‘0‘;ch=getchar();}
    return x*f;
}
int n,m,cnt,ans;
int head[10005],d[10005],q[10005],col[10005],hash[10005];
bool vis[10005];
struct data{int to,next;}e[2000005];
void ins(int u,int v)
{e[++cnt].to=v;e[cnt].next=head[u];head[u]=cnt;}
int main()
{
    n=read();m=read();
    for(int i=1;i<=m;i++)
    {
        int u=read(),v=read();
        ins(u,v);ins(v,u);
    }
    for(int i=n;i;i--)
    {
        int t=0;
        for(int j=1;j<=n;j++)
        {
            if(!vis[j]&&d[j]>=d[t])t=j;
        }
        vis[t]=1;q[i]=t;
        for(int j=head[t];j;j=e[j].next)
            d[e[j].to]++;
    }
    for(int i=n;i>0;i--)
    {
        int t=q[i];  
        for(int j=head[t];j;j=e[j].next)hash[col[e[j].to]]=i;
        int j;
        for(j=1;;j++)if(hash[j]!=i)break;
        col[t]=j;
        if(j>ans)ans=j;
    }
    printf("%d",ans);
    return 0;
}

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