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Submission #1100005

# Submission time Handle Problem Language Result Execution time Memory
1100005 2024-10-12T11:20:50 Z vjudge1 Rack (eJOI19_rack) C++17
100 / 100
 1 ms 348 KB 
#include <iostream>
#include <map>
#include <unordered_map>
#include <set>
#include <vector>
#include <queue>
#include <algorithm>
#include <cmath>
#include <iomanip>
using namespace std;
#define ll long long
#define PLL pair<ll, ll>
#define PB push_back
#define F first
#define S second
#define MP make_pair
const ll INF = 999999999999999999;
const ll M = 1000000000+7;

ll binExp(ll a, ll b){
    if(a==1){
        return 1;
    }
    if(b==0){
        return 1;
    }
    ll ans = 1;
    if(b%2==1){
        ans = a;
    }
    return (binExp((a*a)%M,b/2)*ans)%M;
}


ll solve(ll n, ll k){
    ll index = 1,npow = 1,tpow = 1, m = binExp(2,n),Inv = binExp(2,M-2);
    k--;
    //cout<<m<<" "<<Inv<<endl;
    for(ll i=0; i<=n; i++){
        if(npow>k or npow<1){
            break;
        }
        //cout<<(k&tpow)<<" "<<tpow<<endl;
        if((k&npow)!=0){
            //cout<<(m/tpow)/2<<endl;
            index = (index + ((Inv*((m*tpow)%M))%M))%M;
        }
        //cout<<index<<endl;
        tpow = (tpow*Inv)%M;
        npow*=2;
    }
    return index;
}

int main(){
    ll n,k;
    cin>>n>>k;
    cout<<solve(n,k);
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct

Subtask #3
60.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct