제출 #1042589

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1042589		Theo830	Flooding Wall (BOI24_wall)	C++17	12 / 100	36 ms	10204 KiB

Main

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll INF = 1e9+7;
const ll MOD = 998244353;
typedef pair<ll,ll> ii;
#define iii pair<ii,ll>
#define f(i,a,b) for(ll i = a;i < b;i++)
#define pb push_back
#define vll vector<ll>
#define F first
#define S second
#define all(x) (x).begin(), (x).end()
///I hope I will get uprating and don't make mistakes
///I will never stop programming
///sqrt(-1) Love C++
///Please don't hack me
///@TheofanisOrfanou Theo830
///Think different approaches (bs,dp,greedy,graphs,shortest paths,mst)
///Stay Calm
///Look for special cases
///Beware of overflow and array bounds
///Think the problem backwards
///Training
int main(void){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    ll n;
    cin>>n;
    ll a[n],b[n];
    f(i,0,n){
        cin>>a[i];
    }
    f(i,0,n){
        cin>>b[i];
    }
    ll ans = 0;
    ll p = 1;
    f(k,1,n-1){
        ll sum = p * (n - 1 - k);
        sum %= INF;
        sum *= k;
        sum %= INF;
        ans += sum;
        ans %= INF;
        p *= 2;
        p %= INF;
    }
    cout<<ans<<"\n";
}

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