Submission #634724

#	Time	Username	Problem	Language	Result	Execution time	Memory
634724		smartmonky	Rack (eJOI19_rack)	C++14	100 / 100	10 ms	8124 KiB

rack

#include <iostream>
#include <algorithm>
#include <vector>
#include <math.h>
#include <set>
#include <map>
 
#define ll long long
#define ff first
#define ss second
#define pb push_back
#define all(x) (x).begin(),(x).end()
#define int ll
using namespace std;
const int N=1e6+6,mod=1e9+7;
int pw[N];
main(){
    int n,k;
    cin >>n >>k;
    pw[0]=1;
    int ans=0;
	for(int i=1;i<N;i++)
		pw[i]=(pw[i-1]*2)%mod;
	for(int i=0;i<60;i++){
		int s=n;
		for(int j=0;j<=n;j++){
			if(k<=(1LL <<j)){
				if(j==0){
					cout<<(ans+1)%mod;
					exit(0);
				}
				ans=(ans+pw[s])%mod;
				k-=(1LL << (j-1));
				break;
			}else
				s--;
		}
	}
}

Compilation message (stderr)

rack.cpp:17:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   17 | main(){
      | ^~~~

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