Submission #288453

#	Time	Username	Problem	Language	Result	Execution time	Memory
288453		topovik	Rack (eJOI19_rack)	C++14	100 / 100	19 ms	8684 KiB

rack

#include <bits/stdc++.h>

#define f first
#define s second
#define pb push_back
#define INF 1000000000

using namespace std;

typedef long long ll;
typedef long double ld;

const ll oo = 1e9+7;
const ll N = 1e6;

int main()
{
    ll n,k;
    cin>>n>>k;
    vector <ll> steps;
    for (ll i=0; i<n; i++)
    {
        if (!(k&1))
        {
            k>>=1;
            steps.pb(1);
        }
        else {steps.pb(0);k=(k+1)/2;}
    }
    ll ans=0;
    for (ll i=0; i<steps.size(); i++) ans=(ans*2+steps[i])%oo;
    cout<<1+ans;
}

Compilation message (stderr)

rack.cpp: In function 'int main()':
rack.cpp:31:19: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |     for (ll i=0; i<steps.size(); i++) ans=(ans*2+steps[i])%oo;
      |                  ~^~~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 60 / 60