LCA最近公共祖先模板代码

vector模拟邻接表：

#include
#include
#include
#include
#include
#include
#define eps 1e-8
#define memset(a,v) memset(a,v,sizeof(a))
using namespace std;
typedef long long int LL;
const int MAXL(1e4);
const int INF(0x7f7f7f7f);
const int mod(1e9+7);
int dir[4][2]= {{-1,0},{1,0},{0,1},{0,-1}};
int father[MAXL+50];
bool is_root[MAXL+50];
bool vis[MAXL+50];
vectorv[MAXL+50];
int root;
int cx,cy;
int ans;
int Find(int x)
{
    if(x!=father[x])
        father[x]=Find(father[x]);
    return father[x];
}
 
void Join(int x,int y)
{
    int fx=Find(x),fy=Find(y);
    if(fx!=fy)
        father[fy]=fx;
}
 
void LCA(int u)
{
    for(int i=0; i

链式前向星写法：

#include
#include
#include
#include
#include
#include
#define eps 1e-8
#define memset(a,v) memset(a,v,sizeof(a))
using namespace std;
typedef long long int LL;
const int MAXL(1e6);
const int INF(0x7f7f7f7f);
const int mod(1e9+7);
int dir[4][2]= {{-1,0},{1,0},{0,1},{0,-1}};
struct node
{
    int to;
    int next;
}edge[MAXL+50];
int head[MAXL+50];
int father[MAXL+50];
bool vis[MAXL+50];
bool is_root[MAXL+50];
int n;
int cnt;
int cx,cy;
int ans;
int root;
 
 
int Find(int x)
{
    if(x!=father[x])
        father[x]=Find(father[x]);
    return father[x];
}
 
void Join(int x,int y)
{
    int fx=Find(x),fy=Find(y);
    if(fx!=fy)
        father[fy]=fx;
}
 
void add_edge(int x,int y)
{
    edge[cnt].to=y;
    edge[cnt].next=head[x];
    head[x]=cnt++;
}
 
void init()
{
    cnt=0;
    memset(head,-1);
    memset(vis,false);
    memset(is_root,true);
    scanf("%d",&n);
    for(int i=0;i<=n;i++)
        father[i]=i;
    for(int i=1;i

转自：https://blog.csdn.net/Akatsuki__Itachi/article/details/81279173