Submission #24115464

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef pair<int,int> P;
typedef pair<ll,ll> Pll;
typedef pair<string,string> Pstring;
typedef pair<double,double> Pdouble;


#define REP(i,n) for(ll i=0;i<n;i++)
#define REP1(i,n) for(ll i=1;i<=n;i++)
#define Precision13 cout << fixed << setprecision(13)
const double PI=3.14159265358979323846;
const int MAX = 510000;
const int MOD = 1000000007;
const int INF = 1<<29;
using Graph = vector<vector<ll>>;

int main(){

  ll n, x;
  cin >> n >> x;

  vector<ll> a(n+1);

  ll sum = 0;

  REP1(i,n){
    cin >> a.at(i);

    sum +=a.at(i);
    if(i%2==0){
      sum--;
    }

  }

  if(sum<=x){
    cout <<"Yes" << endl;
  }else{
    cout <<"No" << endl;
  }


}

Submission Info

Judge Result