Submission #5946845

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Source Code Expand

#include <iostream>
#include <algorithm>
#include <vector>
#include <map>
#include <utility>
#include <iomanip>
#include <cmath>
#include <set>
using namespace std;
#define REP(i,n) for (int i=0;i<(n);++i)
#define rep(i,a,b) for(int i=a;i<(b);++i)
template<class T> inline bool chmin(T &a, T b){ if(a > b) { a = b; return true;} return false;}
template<class T> inline bool chmax(T &a, T b){ if(a < b) { a = b; return true;} return false;}
using ll = long long;
constexpr ll INF = 1LL << 60;
constexpr ll MOD = 1e9 + 7;
 
int main() {
    cin.tie(0); ios_base::sync_with_stdio(false);
    ll n,X;cin>>n>>X;
    vector<ll> a(n+1);
    REP(i,n) cin >> a[i];
    ll ans = 0;
    REP(i,n){
        if(X&(1<<i)) ans += a[i];
    }
    cout << ans << endl;
    return 0;
}

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