結果

問題 No.1869 Doubling?
ユーザー anmichi
提出日時 2022-03-11 21:30:05
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 18 ms / 2,000 ms
コード長 3,818 bytes
コンパイル時間 2,248 ms
コンパイル使用メモリ 203,460 KB
最終ジャッジ日時 2025-01-28 08:13:30
ジャッジサーバーID
（参考情報） 		judge4 / judge5
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 43
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, n) for (int i = 0; i < n; i++)
#define all(v) v.begin(), v.end()
template <class T, class U>
inline bool chmax(T &a, U b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}
template <class T, class U>
inline bool chmin(T &a, U b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}
constexpr int INF = 1000000000;
constexpr ll llINF = 3000000000000000000;
constexpr int mod = 1000000007;
const ll half = (mod + 1) / 2;
constexpr double eps = 1e-10;
vector<int> prime_list(int n) {
    vector<int> v(n + 1), res;
    for (int i = n; i >= 2; i--) {
        for (int j = i; j <= n; j += i) v[j] = i;
    }
    for (int i = 2; i <= n; i++) {
        if (v[i] == i) res.push_back(i);
    }
    return res;
}
vector<int> next_divisor(int n) {
    vector<int> v(n + 1);
    for (int i = n; i >= 2; i--) {
        for (int j = i; j <= n; j += i) v[j] = i;
    }
    return v;
}
ll modpow(ll a, ll b, ll m = mod) {
    ll res = 1;
    while (b) {
        if (b & 1) {
            res *= a;
            res %= m;
        }
        a *= a;
        a %= m;
        b >>= 1;
    }
    return res;
}
vector<ll> inv, fact, factinv;
void init_fact(int n) {
    inv.resize(n + 1);
    fact.resize(n + 1);
    factinv.resize(n + 1);
    inv[0] = 0;
    inv[1] = 1;
    fact[0] = 1;
    factinv[0] = 1;
    for (ll i = 1; i <= n; i++) {
        if (i >= 2) inv[i] = mod - ((mod / i) * inv[mod % i] % mod);
        fact[i] = (fact[i - 1] * i) % mod;
        factinv[i] = factinv[i - 1] * inv[i] % mod;
    }
}
ll modinv(ll a, ll m = mod) {
    // gcd(a,m) must be 1
    ll b = m, u = 1, v = 0;
    while (b) {
        ll t = a / b;
        a -= t * b;
        swap(a, b);
        u -= t * v;
        swap(u, v);
    }
    u %= m;
    if (u < 0) u += m;
    return u;
}
ll comb(int a, int b) {
    if (a < b || a < 0 || b < 0) return 0;
    return fact[a] * factinv[a - b] % mod * factinv[b] % mod;
}
using S = pair<int, int>;
S op(S a, S b) { return max(a, b); }
S e() { return S{-1, 0}; }
struct dual_segtree {
    int sz = 1, log = 0;
    vector<S> lz;
    dual_segtree(vector<S> a) {
        int n = a.size();
        while (sz < n) {
            sz <<= 1;
            log++;
        }
        lz.assign(sz << 1, e());
        for (int i = 0; i < n; i++) lz[i + sz] = a[i];
    }
    void push(int k) {
        int b = __builtin_ctz(k);
        for (int d = log; d > b; d--) {
            lz[k >> d << 1] = op(lz[k >> d << 1], lz[k >> d]);
            lz[k >> d << 1 | 1] = op(lz[k >> d << 1 | 1], lz[k >> d]);
            lz[k >> d] = e();
        }
    }
    void apply(int l, int r, S x) {
        l += sz, r += sz;
        push(l);
        push(r);
        while (l < r) {
            if (l & 1) {
                lz[l] = op(lz[l], x);
                l++;
            }
            if (r & 1) {
                r--;
                lz[r] = op(lz[r], x);
            }
            l >>= 1, r >>= 1;
        }
    }
    S get(int k) {
        k += sz;
        S res = e();
        while (k) {
            res = op(res, lz[k]);
            k >>= 1;
        }
        return res;
    }
};
void solve() {
    int n, m;
    cin >> n >> m;
    vector<int> a{m};
    while (a.back() > 1) {
        if (a.back() % 2 == 0) {
            a.push_back(a.back() / 2);
        } else {
            a.push_back((a.back() + 1) / 2);
        }
    }
    if (n >= a.size()) {
        ll ans = 0;
        for (int i : a) ans += i;
        ans += n - a.size();
        cout << ans << endl;
        return;
    }
    ll ans = 0;
    rep(i, n) ans += (1 << i);
    cout << ans << endl;
}
int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    /*int t;
    cin >> t;
    while (t--)*/
    solve();
}
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