Codevs1995 黑魔法師之門
hzw：並查集維護，如果兩點，在同一集合中 ans*2+1

#include <cstdio>
#include <cstring>
#include <iostream>
#include <cstdlib>
using namespace std;

#define MAXN (300020)
#define mod (1000000009)
int first[MAXN], nxt[MAXN<<1], fa[MAXN];
struct edge{
    int from, to, cost;
}es[MAXN << 1
 
];

int find(int x)
{
    int r = x;
    while(r != fa[r])
        r = fa[r];
    int t;
    while(x != r)
    {
        t = fa[x];
        fa[x] = r;
        x = t;
    } 
    return r;
} 

void read(int &a)
{
    a = 0; bool f = 0;
    char ch = getchar();
    while(!isdigit(ch))
    {
        if
 
(ch == '-') f = 1;
        ch = getchar();
    }
    while(isdigit(ch))
    {
        a *= 10;
        a += (ch-'0');
        ch = getchar(); 
    }
    if(f) a *= -1;
}

int main()
{
    int n, m, ans = 0;
    read(n);read(m);
    for(int i = 1; i <= n; ++ i) fa[i] = i;
    while(m--)
    {
        int
 
 a, b;
        read(a);read(b);
        int ya = find(a), yb = find(b);
        if(ya != yb) fa[ya] = yb;
        else ans = (((ans%mod)*2)%mod+1)%mod;
        printf("%d\n", ans);
    }

    return 0;
}