Strongly Connected Component

#include<bits/stdc++.h>
using namespace std;

#define si(n) scanf("%d",&n)
#define MAX 100005

bool vis[MAX];
vector<int>temp;
vector<int>graph[MAX],rev_graph[MAX];

void dfs(int now)
{
    if(vis[now])
        return;
    vis[now]=true;

    for(int i=0;i<graph[now].size();i++){
        dfs(graph[now][i]);
    }
    temp.push_back(now);
}

void rev_dfs(int now){
    if(vis[now])
        return ;
    vis[now]=true;
    for(int i=0;i<rev_graph[now].size();i++)
        rev_dfs(rev_graph[now][i]);
}

int main()
{
    //freopen("input.txt","r",stdin);
    int i,n,m,scc=0;
    si(n);si(m);

    for(i=0;i<m;i++){
        int u,v;
        si(u);si(v);
        graph[u].push_back(v);
        rev_graph[v].push_back(u);
    }

    memset(vis,false,sizeof(vis));
    for(i=1;i<=n;i++){
        if(!vis[i])dfs(i);
    }
    memset(vis,false,sizeof(vis));

    for(i=temp.size()-1;i>=0;i--){
        int now=temp[i];
        if(vis[now])
            continue;
        rev_dfs(now);
        scc++;
    }

    printf("total scc = %d",scc);

    return 0;

}