Submission #999755

#	Time	Username	Problem	Language	Result	Execution time	Memory
999755		LilPluton	Rack (eJOI19_rack)	C++14	0 / 100	1 ms	348 KiB

rack

#include <bits/stdc++.h>
// author : Pluton
#define OPT         ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define int         ll
#define ll          long long
#define pb          push_back
#define arr         array
#define fi          first
#define se          second
#define rep(i,j,k)  for(int i = j; i <= k; ++i)
#define all(a)      a.begin(),a.end()
#define pii         pair<int,int>
using namespace std;
const int INF = 1e18;

struct BIT
{
    int n;
    vector<int> ft;
    void init(int N)
    {
        n = N + 5;
        ft.assign(n + 5, 0);
    }
    void add(int pos, int val)
    {
        for (pos = pos + 1; pos <= n; pos += pos & -pos) ft[pos] += val;
    }
    int get(int pos, int res = 0)
    {
        for (pos = pos + 1; pos > 0; pos -= pos & -pos) res += ft[pos];
        return res;
    }
};
int ans =0 ;
int f(int n, int k, int val)
{
    int v = 0;
    if(n == 0)
        return 0;
    int a = 0;
    if(n < 64)
    {
        int op = pow(2, n - 1);
        if(k >= op)
        {
            v += pow(2, val);
            f(n - 1, k - op, val + 1);
            ans += v;
            return 0;
        }
    }
    f(n - 1, k, val + 1);
    ans += val;
    return 0;
}
void _()
{
    int n, k;
    cin >> n >> k;
    --k;
    f(n, k, 0);
    cout << ans;
}

signed main()
{
    OPT
    int tc = 1;
    while(tc--)
    {
        _();
    }
}

Compilation message (stderr)

rack.cpp: In function 'long long int f(long long int, long long int, long long int)':
rack.cpp:41:9: warning: unused variable 'a' [-Wunused-variable]
   41 |     int a = 0;
      |         ^

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