제출 #1133065

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1133065		ByeWorld	Rack (eJOI19_rack)	C++20	100 / 100	1 ms	328 KiB

rack

#include <bits/stdc++.h>
#define int long long
#define ll long long
#define pb push_back
#define fi first
#define se second
#define lf (id<<1)
#define rg ((id<<1)|1)
#define md ((l+r)>>1)
#define ld long double
using namespace std;
typedef pair<int,int> pii;
typedef pair<char,char> pcc;
typedef pair<int,pii> ipii;
typedef pair<pii,pii> ipiii;
const int MAXN = 2e5+10;
const int SQRT = 610;
const int MAXA = 50;
const int MOD = 1e9+7;
const int INF = 1e9+10;
const int LOG = 21;
const ld EPS = 1e-12;
int sum(int a,int b){ return (a+b)%MOD; }
int mul(int a,int b){ return a*b%MOD; }
int expo(int a, int b){
	if(b==0)return 1;
	int te = expo(a,b/2); te = mul(te,te);
	return (b%2 ? mul(te,a) : te);
}

signed main(){
    // ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    int n,k;cin>>n>>k;
    int ans = 1;
    while(true){
    	n--;
    	if(n==-1) break;
    	if(k%2==0){
    		ans = sum(ans, expo(2, n));
    		k /= 2;
    	} else {
    		k = (k+1)/2;
    	}
    }
    cout << ans << '\n';
}

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