P6075 [JSOI2015]子集选取, 计数1

最新推荐文章于 2025-05-01 21:36:18 发布

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最新推荐文章于 2025-05-01 21:36:18 发布

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本文链接：https://blog.youkuaiyun.com/gkajvsbja/article/details/127176293

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//https://www.luogu.com.cn/problem/P6075
#include<bits/stdc++.h>
#include<unordered_map>
#include<array>
#define ll long long
#define ull unsigned long long
#define all(a) a.begin(),a.end()
#define IOS ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
using namespace std;

const int inf = 0x3f3f3f3f;
const ll INF = 0x3f3f3f3f3f3f3f3f;
const double eps = 1e-8;
const ll mod = 1e9 + 7;
const int N = 1e3 + 5;

ll qpow(ll base, ll pow)
{
    ll ans = 1;
    while (pow)
    {
        if (pow & 1)
            ans = ans * base % mod;
        pow >>= 1;
        base = base * base % mod;
    }
    return ans;
}

void solve()
{
    ll n, k;
    cin >> n >> k;
    cout << qpow(2, n * k % (mod - 1));//mod是质数，根据费马小定理，a^(p-1) ≡ 1（mod p）
}

signed main()
{
    IOS;
    int t = 1;
    //cin >> t;
    while (t--)
        solve();
    return 0;
}