제출 #473311

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
473311		_L__	Usmjeri (COCI17_usmjeri)	C++17	0 / 140	201 ms	3248 KiB

usmjeri

// This code is written by _L__
#include <bits/stdc++.h>
using namespace std;
#define endl '\n'
#define F_word ios_base::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL);
typedef long long ll;
typedef long double ld;
const int mod = 1e9+7, N = 2e5+13, inf = 1e9+1;
const ld E = 1e-6;
#define ff first
#define ss second

ll fast(ll base, ll power){
    ll ans = 1;
    while(power >0){
    if(power%2){
        ans = (ans*base)%mod;
    }
    base = (base*base)%mod;
    power /= 2;
    }
    return ans;
}

int main(void){
    F_word;
    ll n, m; cin >> n >> m;
    for(int i = 1; i < n; ++i){int x, y; cin >> x >> y;}
    for(int i = 0; i < m; ++i){
        ll x, y; cin >> x >> y;
        if(x < y) swap(x, y);
        ll z = (y-1)+(n-x);
        cout << fast(2,z+1) << endl;
    }
} 

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