#841189 (C++17) No.2223 Merged Med

• 問題: No.2223 Merged Med
• ユーザー: torisasami4
• 提出日時: 2023-02-17 22:28:43
• 言語: C++17 (gcc 12.3.0 + boost 1.83.0)
• 結果: AC
• 実行時間: 500 ms / 7,000 ms
• コード長: 9,150 bytes
• コンパイル時間: 2,963 ms
• コンパイル使用メモリ: 230,440 KB
• 実行使用メモリ: 10,468 KB
• 最終ジャッジ日時: 2023-09-26 19:45:11
• 合計ジャッジ時間: 12,917 ms
• ジャッジサーバーID （参考情報）: judge11 / judge12

入力	結果	実行時間; 実行使用メモリ
testcase_00	AC	2 ms; 4,384 KB
testcase_01	AC	2 ms; 4,380 KB
testcase_02	AC	2 ms; 4,380 KB
testcase_03	AC	2 ms; 4,376 KB
testcase_04	AC	1 ms; 4,380 KB
testcase_05	AC	1 ms; 4,376 KB
testcase_06	AC	1 ms; 4,380 KB
testcase_07	AC	2 ms; 4,376 KB
testcase_08	AC	2 ms; 4,380 KB
testcase_09	AC	1 ms; 4,376 KB
testcase_10	AC	1 ms; 4,380 KB
testcase_11	AC	1 ms; 4,380 KB
testcase_12	AC	2 ms; 4,380 KB
testcase_13	AC	156 ms; 5,308 KB
testcase_14	AC	74 ms; 4,380 KB
testcase_15	AC	283 ms; 8,764 KB
testcase_16	AC	410 ms; 9,600 KB
testcase_17	AC	149 ms; 6,488 KB
testcase_18	AC	69 ms; 4,400 KB
testcase_19	AC	138 ms; 5,168 KB
testcase_20	AC	500 ms; 9,960 KB
testcase_21	AC	495 ms; 9,956 KB
testcase_22	AC	495 ms; 9,816 KB
testcase_23	AC	493 ms; 9,932 KB
testcase_24	AC	474 ms; 9,808 KB
testcase_25	AC	466 ms; 9,872 KB
testcase_26	AC	482 ms; 9,888 KB
testcase_27	AC	478 ms; 9,876 KB
testcase_28	AC	484 ms; 9,876 KB
testcase_29	AC	481 ms; 9,904 KB
testcase_30	AC	270 ms; 10,380 KB
testcase_31	AC	264 ms; 9,080 KB
testcase_32	AC	10 ms; 4,380 KB
testcase_33	AC	448 ms; 9,872 KB
testcase_34	AC	376 ms; 10,468 KB
testcase_35	AC	371 ms; 9,020 KB

ソースコード

#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math")
#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < int(n); i++)
#define per(i, n) for (int i = (n)-1; 0 <= i; i--)
#define rep2(i, l, r) for (int i = (l); i < int(r); i++)
#define per2(i, l, r) for (int i = (r)-1; int(l) <= i; i--)
#define each(e, v) for (auto& e : v)
#define MM << " " <<
#define pb push_back
#define eb emplace_back
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
#define sz(x) (int)x.size()
template <typename T> void print(const vector<T>& v, T x = 0) {
    int n = v.size();
    for (int i = 0; i < n; i++) cout << v[i] + x << (i == n - 1 ? '\n' : ' ');
    if (v.empty()) cout << '\n';
}
using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
template <typename T> bool chmax(T& x, const T& y) {
    return (x < y) ? (x = y, true) : false;
}
template <typename T> bool chmin(T& x, const T& y) {
    return (x > y) ? (x = y, true) : false;
}
template <class T>
using minheap = std::priority_queue<T, std::vector<T>, std::greater<T>>;
template <class T> using maxheap = std::priority_queue<T>;
template <typename T> int lb(const vector<T>& v, T x) {
    return lower_bound(begin(v), end(v), x) - begin(v);
}
template <typename T> int ub(const vector<T>& v, T x) {
    return upper_bound(begin(v), end(v), x) - begin(v);
}
template <typename T> void rearrange(vector<T>& v) {
    sort(begin(v), end(v));
    v.erase(unique(begin(v), end(v)), end(v));
}

// __int128_t gcd(__int128_t a, __int128_t b) {
//     if (a == 0)
//         return b;
//     if (b == 0)
//         return a;
//     __int128_t cnt = a % b;
//     while (cnt != 0) {
//         a = b;
//         b = cnt;
//         cnt = a % b;
//     }
//     return b;
// }

long long extGCD(long long a, long long b, long long& x, long long& y) {
    if (b == 0) {
        x = 1;
        y = 0;
        return a;
    }
    long long d = extGCD(b, a % b, y, x);
    y -= a / b * x;
    return d;
}

struct UnionFind {
    vector<int> data;
    int num;

    UnionFind(int sz) {
        data.assign(sz, -1);
        num = sz;
    }

    bool unite(int x, int y) {
        x = find(x), y = find(y);
        if (x == y) return (false);
        if (data[x] > data[y]) swap(x, y);
        data[x] += data[y];
        data[y] = x;
        num--;
        return (true);
    }

    int find(int k) {
        if (data[k] < 0) return (k);
        return (data[k] = find(data[k]));
    }

    int size(int k) { return (-data[find(k)]); }

    bool same(int x, int y) { return find(x) == find(y); }

    int operator[](int k) { return find(k); }
};

template <int mod> struct Mod_Int {
    int x;

    Mod_Int() : x(0) {}

    Mod_Int(long long y) : x(y >= 0 ? y % mod : (mod - (-y) % mod) % mod) {}

    static int get_mod() { return mod; }

    Mod_Int& operator+=(const Mod_Int& p) {
        if ((x += p.x) >= mod) x -= mod;
        return *this;
    }

    Mod_Int& operator-=(const Mod_Int& p) {
        if ((x += mod - p.x) >= mod) x -= mod;
        return *this;
    }

    Mod_Int& operator*=(const Mod_Int& p) {
        x = (int)(1LL * x * p.x % mod);
        return *this;
    }

    Mod_Int& operator/=(const Mod_Int& p) {
        *this *= p.inverse();
        return *this;
    }

    Mod_Int& operator++() { return *this += Mod_Int(1); }

    Mod_Int operator++(int) {
        Mod_Int tmp = *this;
        ++*this;
        return tmp;
    }

    Mod_Int& operator--() { return *this -= Mod_Int(1); }

    Mod_Int operator--(int) {
        Mod_Int tmp = *this;
        --*this;
        return tmp;
    }

    Mod_Int operator-() const { return Mod_Int(-x); }

    Mod_Int operator+(const Mod_Int& p) const { return Mod_Int(*this) += p; }

    Mod_Int operator-(const Mod_Int& p) const { return Mod_Int(*this) -= p; }

    Mod_Int operator*(const Mod_Int& p) const { return Mod_Int(*this) *= p; }

    Mod_Int operator/(const Mod_Int& p) const { return Mod_Int(*this) /= p; }

    bool operator==(const Mod_Int& p) const { return x == p.x; }

    bool operator!=(const Mod_Int& p) const { return x != p.x; }

    Mod_Int inverse() const {
        assert(*this != Mod_Int(0));
        return pow(mod - 2);
    }

    Mod_Int pow(long long k) const {
        Mod_Int now = *this, ret = 1;
        for (; k > 0; k >>= 1, now *= now) {
            if (k & 1) ret *= now;
        }
        return ret;
    }

    friend ostream& operator<<(ostream& os, const Mod_Int& p) {
        return os << p.x;
    }

    friend istream& operator>>(istream& is, Mod_Int& p) {
        long long a;
        is >> a;
        p = Mod_Int<mod>(a);
        return is;
    }
};

ll mpow2(ll x, ll n, ll mod) {
    ll ans = 1;
    x %= mod;
    while (n != 0) {
        if (n & 1) ans = ans * x % mod;
        x = x * x % mod;
        n = n >> 1;
    }
    ans %= mod;
    return ans;
}

ll modinv2(ll a, ll mod) {
    ll b = mod, u = 1, v = 0;
    while (b) {
        ll t = a / b;
        a -= t * b;
        swap(a, b);
        u -= t * v;
        swap(u, v);
    }
    u %= mod;
    if (u < 0) u += mod;
    return u;
}

ll divide_int(ll a, ll b) {
    if (b < 0) a = -a, b = -b;
    return (a >= 0 ? a / b : (a - b + 1) / b);
}

// const int MOD = 1000000007;
const int MOD = 998244353;
using mint = Mod_Int<MOD>;

mint mpow(mint x, ll n) {
    bool rev = n < 0;
    n = abs(n);
    mint ans = 1;
    while (n != 0) {
        if (n & 1) ans *= x;
        x *= x;
        n = n >> 1;
    }
    return (rev ? ans.inverse() : ans);
}

// ----- library -------
template< typename Monoid >
struct SegmentTree {
  using F = function< Monoid(Monoid, Monoid) >;

  int sz;
  vector< Monoid > seg;

  const F f;
  const Monoid M1;

  SegmentTree(int n, const F f, const Monoid &M1) : f(f), M1(M1) {
    sz = 1;
    while(sz < n) sz <<= 1;
    seg.assign(2 * sz, M1);
  }

  void set(int k, const Monoid &x) {
    seg[k + sz] = x;
  }

  void build() {
    for(int k = sz - 1; k > 0; k--) {
      seg[k] = f(seg[2 * k + 0], seg[2 * k + 1]);
    }
  }

  void update(int k, const Monoid &x) {
    k += sz;
    seg[k] = x;
    while(k >>= 1) {
      seg[k] = f(seg[2 * k + 0], seg[2 * k + 1]);
    }
  }

  Monoid query(int a, int b) {
    Monoid L = M1, R = M1;
    for(a += sz, b += sz; a < b; a >>= 1, b >>= 1) {
      if(a & 1) L = f(L, seg[a++]);
      if(b & 1) R = f(seg[--b], R);
    }
    return f(L, R);
  }

  Monoid operator[](const int &k) const {
    return seg[k + sz];
  }

  template< typename C >
  int find_subtree(int a, const C &check, Monoid &M, bool type) {
    while(a < sz) {
      Monoid nxt = type ? f(seg[2 * a + type], M) : f(M, seg[2 * a + type]);
      if(check(nxt)) a = 2 * a + type;
      else M = nxt, a = 2 * a + 1 - type;
    }
    return a - sz;
  }


  template< typename C >
  int find_first(int a, const C &check) {
    Monoid L = M1;
    if(a <= 0) {
      if(check(f(L, seg[1]))) return find_subtree(1, check, L, false);
      return -1;
    }
    int b = sz;
    for(a += sz, b += sz; a < b; a >>= 1, b >>= 1) {
      if(a & 1) {
        Monoid nxt = f(L, seg[a]);
        if(check(nxt)) return find_subtree(a, check, L, false);
        L = nxt;
        ++a;
      }
    }
    return -1;
  }

  template< typename C >
  int find_last(int b, const C &check) {
    Monoid R = M1;
    if(b >= sz) {
      if(check(f(seg[1], R))) return find_subtree(1, check, R, true);
      return -1;
    }
    int a = sz;
    for(b += sz; a < b; a >>= 1, b >>= 1) {
      if(b & 1) {
        Monoid nxt = f(seg[--b], R);
        if(check(nxt)) return find_subtree(b, check, R, true);
        R = nxt;
      }
    }
    return -1;
  }
};

struct st {
    int ml, mr, ma, sum;
    st(int f) : ml(-1 + f * 2), mr(-1 + f * 2), ma(-1 + f * 2), sum(-1 + f * 2) {}
    st() : ml(-1e9), mr(-1e9), ma(-1e9), sum(0) {}
};

st f(const st &a, const st &b) {
    st ret;
    ret.ml = max(a.ml, a.sum + b.ml);
    ret.mr = max(b.mr, a.mr + b.sum);
    ret.ma = max(a.mr + b.ml, max(a.ma, b.ma));
    ret.sum = a.sum + b.sum;
    return ret;
}
// ----- library -------

int main() {
    ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    cout << fixed << setprecision(15);
    
    int n, q;
    cin >> n >> q;
    vector<int> a(n);
    rep(i, n) cin >> a[i];
    vector<int> l(q), r(q);
    rep(i, q) cin >> l[i] >> r[i], l[i]--;
    vector<int> ok(q, n), ng(q, 0);
    vector<vector<int>> idx(n + 1);
    rep(i, n) idx[a[i]].eb(i);
    while (1) {
        bool fin = true;
        vector<vector<int>> ls(n);
        rep(i, q) {
            if (abs(ok[i] - ng[i]) > 1) {
                fin = false;
                int mid = ok[i] + ng[i] >> 1;
                ls[mid].eb(i);
            }
        }
        if (fin)
            break;
        SegmentTree<st> seg(n, f, st());
        rep(i, n) seg.set(i, st(0));
        seg.build();
        per2(i, 1, n) {
            each(e, idx[i + 1]) seg.update(e, st(1));
            each(id, ls[i]) {
                auto ret = seg.query(l[id], r[id]);
                (ret.sum - max(0, ret.ma - 1) < 0 ? ok[id] : ng[id]) = i;
            }
        }
    }
    rep(i, q) cout << ok[i] << '\n';
}