Luzhiled's Library

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:x: test/verify/yosupo-range-kth-smallest-2.test.cpp

Depends on

Code

#define PROBLEM "https://judge.yosupo.jp/problem/range_kth_smallest"

#include "../../template/template.hpp"

#include "../../structure/wavelet/succinct-indexable-dictionary.hpp"
#include "../../structure/wavelet/wavelet-tree.hpp"

int main() {
  int N, Q;
  cin >> N >> Q;
  vector< int > A(N);
  cin >> A;
  CompressedWaveletTree< int, 18 > mat(A);
  for(int i = 0; i < Q; i++) {
    int a, b, c;
    cin >> a >> b >> c;
    cout << mat.kth_smallest(a, b, c) << "\n";
  }
}
#line 1 "test/verify/yosupo-range-kth-smallest-2.test.cpp"
#define PROBLEM "https://judge.yosupo.jp/problem/range_kth_smallest"

#line 1 "template/template.hpp"
#include<bits/stdc++.h>

using namespace std;

using int64 = long long;
const int mod = 1e9 + 7;

const int64 infll = (1LL << 62) - 1;
const int inf = (1 << 30) - 1;

struct IoSetup {
  IoSetup() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(10);
    cerr << fixed << setprecision(10);
  }
} iosetup;

template< typename T1, typename T2 >
ostream &operator<<(ostream &os, const pair< T1, T2 >& p) {
  os << p.first << " " << p.second;
  return os;
}

template< typename T1, typename T2 >
istream &operator>>(istream &is, pair< T1, T2 > &p) {
  is >> p.first >> p.second;
  return is;
}

template< typename T >
ostream &operator<<(ostream &os, const vector< T > &v) {
  for(int i = 0; i < (int) v.size(); i++) {
    os << v[i] << (i + 1 != v.size() ? " " : "");
  }
  return os;
}

template< typename T >
istream &operator>>(istream &is, vector< T > &v) {
  for(T &in : v) is >> in;
  return is;
}

template< typename T1, typename T2 >
inline bool chmax(T1 &a, T2 b) { return a < b && (a = b, true); }

template< typename T1, typename T2 >
inline bool chmin(T1 &a, T2 b) { return a > b && (a = b, true); }

template< typename T = int64 >
vector< T > make_v(size_t a) {
  return vector< T >(a);
}

template< typename T, typename... Ts >
auto make_v(size_t a, Ts... ts) {
  return vector< decltype(make_v< T >(ts...)) >(a, make_v< T >(ts...));
}

template< typename T, typename V >
typename enable_if< is_class< T >::value == 0 >::type fill_v(T &t, const V &v) {
  t = v;
}

template< typename T, typename V >
typename enable_if< is_class< T >::value != 0 >::type fill_v(T &t, const V &v) {
  for(auto &e : t) fill_v(e, v);
}

template< typename F >
struct FixPoint : F {
  explicit FixPoint(F &&f) : F(forward< F >(f)) {}

  template< typename... Args >
  decltype(auto) operator()(Args &&... args) const {
    return F::operator()(*this, forward< Args >(args)...);
  }
};
 
template< typename F >
inline decltype(auto) MFP(F &&f) {
  return FixPoint< F >{forward< F >(f)};
}
#line 4 "test/verify/yosupo-range-kth-smallest-2.test.cpp"

#line 1 "structure/wavelet/succinct-indexable-dictionary.hpp"
/**
 * @brief Succinct Indexable Dictionary(完備辞書)
 */
struct SuccinctIndexableDictionary {
  size_t length;
  size_t blocks;
  vector< unsigned > bit, sum;

  SuccinctIndexableDictionary() = default;

  SuccinctIndexableDictionary(size_t length) : length(length), blocks((length + 31) >> 5) {
    bit.assign(blocks, 0U);
    sum.assign(blocks, 0U);
  }

  void set(int k) {
    bit[k >> 5] |= 1U << (k & 31);
  }

  void build() {
    sum[0] = 0U;
    for(int i = 1; i < blocks; i++) {
      sum[i] = sum[i - 1] + __builtin_popcount(bit[i - 1]);
    }
  }

  bool operator[](int k) {
    return (bool((bit[k >> 5] >> (k & 31)) & 1));
  }

  int rank(int k) {
    return (sum[k >> 5] + __builtin_popcount(bit[k >> 5] & ((1U << (k & 31)) - 1)));
  }

  int rank(bool val, int k) {
    return (val ? rank(k) : k - rank(k));
  }
};
#line 1 "structure/wavelet/wavelet-tree.hpp"
/*
 * @brief Wavelet Tree(ウェーブレット木)
 * @docs docs/wavelet-tree.md
 */
template< typename T, int MAXLOG >
struct WaveletTree {

  struct Node {
    SuccinctIndexableDictionary sid;
    Node *ch[2];

    Node() = default;

    Node(size_t length) : sid(length + 1), ch{nullptr} {}

  };

  Node *root;

  Node *build(vector< T > &v, vector< T > &rbuff, int bit, int l, int r) {
    if(l >= r || bit == -1) return nullptr;
    Node *node = new Node(r - l);
    int left = 0, right = 0;
    for(int k = l; k < r; k++) {
      if(((v[k] >> bit) & 1)) {
        rbuff[right++] = v[k];
        node->sid.set(k - l);
      } else {
        v[l + left++] = v[k];
      }
    }
    for(int k = 0; k < right; k++) {
      v[l + left + k] = rbuff[k];
    }
    node->sid.build();
    node->ch[0] = build(v, rbuff, bit - 1, l, l + left);
    node->ch[1] = build(v, rbuff, bit - 1, l + left, r);
    return node;
  }

  WaveletTree() = default;

  WaveletTree(vector< T > v) {
    vector< T > rbuff(v.size());
    root = build(v, rbuff, MAXLOG - 1, 0, v.size());
  }

  int rank(Node *t, int l, int r, const T &x, int level) {
    if(l >= r || t == nullptr) return 0;
    if(level == -1) return r - l;
    bool f = (x >> level) & 1;
    l = t->sid.rank(f, l), r = t->sid.rank(f, r);
    return rank(t->ch[f], l, r, x, level - 1);
  }

  int rank(const T &x, int r) {
    return rank(root, 0, r, x, MAXLOG - 1);
  }

  T kth_smallest(Node *t, int l, int r, int k, int level) {
    if(l >= r || t == nullptr) return 0;
    int cnt = t->sid.rank(false, r) - t->sid.rank(false, l);
    bool f = cnt <= k;
    l = t->sid.rank(f, l), r = t->sid.rank(f, r);
    if(f) return kth_smallest(t->ch[f], l, r, k - cnt, level - 1) | ((T(1) << level));
    return kth_smallest(t->ch[f], l, r, k, level - 1);
  }

  // k-th(0-indexed) smallest number in v[l,r)
  T kth_smallest(int l, int r, int k) {
    assert(0 <= k && k < r - l);
    return kth_smallest(root, l, r, k, MAXLOG - 1);
  }

  // k-th(0-indexed) largest number in v[l,r)
  T kth_largest(int l, int r, int k) {
    return kth_smallest(l, r, r - l - k - 1);
  }

  int range_freq(Node *t, int l, int r, T upper, int level) {
    if(t == nullptr || l >= r) return 0;
    bool f = ((upper >> level) & 1);
    int ret = 0;
    if(f) ret += t->sid.rank(false, r) - t->sid.rank(false, l);
    l = t->sid.rank(f, l), r = t->sid.rank(f, r);
    return range_freq(t->ch[f], l, r, upper, level - 1) + ret;
  }

  // count i s.t. (l <= i < r) && (v[i] < upper)
  int range_freq(int l, int r, T upper) {
    return range_freq(root, l, r, upper, MAXLOG - 1);
  }

  // count i s.t. (l <= i < r) && (lower <= v[i] < upper)
  int range_freq(int l, int r, T lower, T upper) {
    return range_freq(l, r, upper) - range_freq(l, r, lower);
  }

  // max v[i] s.t. (l <= i < r) && (v[i] < upper)
  T prev_value(int l, int r, T upper) {
    int cnt = range_freq(l, r, upper);
    return cnt == 0 ? T(-1) : kth_smallest(l, r, cnt - 1);
  }

  // min v[i] s.t. (l <= i < r) && (lower <= v[i])
  T next_value(int l, int r, T lower) {
    int cnt = range_freq(l, r, lower);
    return cnt == r - l ? T(-1) : kth_smallest(l, r, cnt);
  }
};

template< typename T, int MAXLOG >
struct CompressedWaveletTree {
  WaveletTree< int, MAXLOG > mat;
  vector< T > ys;

  CompressedWaveletTree(const vector< T > &v) : ys(v) {
    sort(begin(ys), end(ys));
    ys.erase(unique(begin(ys), end(ys)), end(ys));
    vector< int > t(v.size());
    for(int i = 0; i < v.size(); i++) t[i] = get(v[i]);
    mat = WaveletTree< int, MAXLOG >(t);
  }

  inline int get(const T &x) {
    return lower_bound(begin(ys), end(ys), x) - begin(ys);
  }

  int rank(const T &x, int r) {
    auto pos = get(x);
    if(pos == ys.size() || ys[pos] != x) return 0;
    return mat.rank(pos, r);
  }

  T kth_smallest(int l, int r, int k) {
    return ys[mat.kth_smallest(l, r, k)];
  }

  T kth_largest(int l, int r, int k) {
    return ys[mat.kth_largest(l, r, k)];
  }

  int range_freq(int l, int r, T upper) {
    return mat.range_freq(l, r, get(upper));
  }

  int range_freq(int l, int r, T lower, T upper) {
    return mat.range_freq(l, r, get(lower), get(upper));
  }

  T prev_value(int l, int r, T upper) {
    auto ret = mat.prev_value(l, r, get(upper));
    return ret == -1 ? T(-1) : ys[ret];
  }

  T next_value(int l, int r, T lower) {
    auto ret = mat.next_value(l, r, get(lower));
    return ret == -1 ? T(-1) : ys[ret];
  }
};

#line 7 "test/verify/yosupo-range-kth-smallest-2.test.cpp"

int main() {
  int N, Q;
  cin >> N >> Q;
  vector< int > A(N);
  cin >> A;
  CompressedWaveletTree< int, 18 > mat(A);
  for(int i = 0; i < Q; i++) {
    int a, b, c;
    cin >> a >> b >> c;
    cout << mat.kth_smallest(a, b, c) << "\n";
  }
}
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