#include <iostream>
#include <string.h>
#include <stdio.h>
#include <stack>
#include <algorithm>
using namespace std;
const int N = 1e6+10;
const int NN = 1e3+10;
struct node{
int to,next;
}edge[N];
int head[NN],top;
int dfn[NN],low[NN],time,num;
stack<int>sta;
vector<int>vec[N];
void init(){
memset(head,-1,sizeof(head));
memset(dfn,0,sizeof(dfn));
top = time = 0;
}
void tarjan(int u,int father){
dfn[u] = ++time;
low[u] = time;
for(int i=head[u]; ~i; i=edge[i].next){
int v = edge[i].to;
if(!dfn[v]){
sta.push(i);//存边
tarjan(v,u);
low[u] = min(low[u],low[v]);
if(low[v] >= dfn[u]){
++num;
while(!sta.empty()){
int j = sta.top();
sta.pop();
vec[num].push_back(j);//存的边
if(j == i)break;
}
}
}
else if(dfn[v] < dfn[u]){
sta.push(i);
low[u] = min(low[u],dfn[v]);
}
}
}
int main()
{
int n;
cin>>n;
for(int i = 1; i <= n; ++i){
if(!dfn[i])tarjan(i,-1);
}
return 0;
}
#include <iostream>
#include <string.h>
#include <stdio.h>
#include <stack>
#include <algorithm>
using namespace std;
const int N = 1e6+10;
const int NN = 1e3+10;
struct node{
int to,next;
}edge[N];
int head[NN],top;
int dfn[NN],low[NN],time,num;
stack<int>sta;
vector<int>vec[N];
void init(){
memset(head,-1,sizeof(head));
memset(dfn,0,sizeof(dfn));
top = time = 0;
}
void tarjan(int u,int father){
dfn[u] = ++time;
low[u] = time;
for(int i=head[u]; ~i; i=edge[i].next){
int v = edge[i].to;
if(!dfn[v]){
sta.push(u);//存点
tarjan(v,u);
low[u] = min(low[u],low[v]);
if(low[v] >= dfn[u]){
++num;
while(!sta.empty()){
int j = sta.top();
sta.pop();
vec[num].push_back(j);//存的点
if(j == u)break;
}
}
}
else if(dfn[v] < dfn[u]){
sta.push(u);
low[u] = min(low[u],dfn[v]);
}
}
}
int main()
{
int n;
cin>>n;
for(int i = 1; i <= n; ++i){
if(!dfn[i])tarjan(i,-1);
}
return 0;
}