Submission #631233

#	Time	Username	Problem	Language	Result	Execution time	Memory
631233		smartmonky	Rack (eJOI19_rack)	C++14	40 / 100	710 ms	98892 KiB

rack

#include <bits/stdc++.h>
#define ll long long
#define pb push_back
using namespace std;
const int mod=1e9+7;
main(){
	int n,k;
	cin >>n >>k;
	int x=(1 << n);
	map<int,int> v,ans;
	v[1]=1;
	ans[1]=1;
	v[2]=x/2+1;
	ans[2]=(v[2]);
	int cnt=2;
	int s=3;
	for(int i=x/4;i>=1;i/=2){
		for(int j=1;j<=cnt;j++){
			if(cnt+j<=x){
				v[cnt+j]=(v[j]+i)%mod;
				ans[s]=v[cnt+j];
				s++;
			}
		}
		cnt*=2;
	}
	cout<<ans[k];
}

Compilation message (stderr)

rack.cpp:6:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    6 | main(){
      | ^~~~

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 0 / 60