oj.uz

Submission #817802

# Submission time Handle Problem Language Result Execution time Memory
817802 2023-08-09T16:34:35 Z MilosMilutinovic Fish 2 (JOI22_fish2) C++14
8 / 100
 4000 ms 39504 KB 
/**
 *    author:  wxhtzdy
 *    created: 07.08.2023 10:57:57
**/
#include <bits/stdc++.h>

using namespace std;

#define int long long

namespace mncnt {
  struct node {
    int mn;
    int cnt;
  };
  node comb(node l, node r) {
    node res;
    res.mn = min(l.mn, r.mn);
    res.cnt = (l.mn == res.mn ? l.cnt : 0) + (r.mn == res.mn ? r.cnt : 0);
    return res;
  }
  vector<node> st;
  vector<int> lzy;
  int n;
  void init(int _n) {
    n = _n;
    st.resize(8 * n);
    lzy.resize(8 * n);
  }
  void push(int x, int l, int r) {
    if (l != r) {
      st[2 * x].mn += lzy[x];
      st[2 * x + 1].mn += lzy[x];
      lzy[2 * x] += lzy[x];
      lzy[2 * x + 1] += lzy[x];
    }
    lzy[x] = 0;
  }
  void pull(int x) {
    st[x] = comb(st[2 * x], st[2 * x + 1]);
  }
  void build(int x, int l, int r) {
    lzy[x] = 0;
    if (l == r) {
      st[x].mn = 0;
      st[x].cnt = 1;
      return;
    }
    int mid = l + r >> 1;
    build(x * 2, l, mid);
    build(x * 2 + 1, mid + 1, r);
    pull(x);
  }
  void update(int x, int l, int r, int ll, int rr, int v) {
    if (l > r || l > rr || r < ll || ll > rr) {
      return;
    }
    if (ll <= l && r <= rr) {
      lzy[x] += v;
      st[x].mn += v;
      push(x, l, r);
      return;      
    }
    push(x, l, r);
    int mid = l + r >> 1;
    update(x * 2, l, mid, ll, rr, v);
    update(x * 2 + 1, mid + 1, r, ll, rr, v);
    pull(x);
  }
  node query(int x, int l, int r, int ll, int rr) {
    if (l > r || l > rr || r < ll || ll > rr) {
      node nd;
      nd.mn = 1000000000;
      nd.cnt = 0;
      return nd;
    }
    if (ll <= l && r <= rr) {
      return st[x];
    }
    push(x, l, r);
    int mid = l + r >> 1;
    node ndl = query(2 * x, l, mid, ll, rr);
    node ndr = query(2 * x + 1, mid + 1, r, ll, rr);
    pull(x);
    return comb(ndl, ndr);
  }
  void update(int l, int r, int v) {
    update(1, 0, n - 1, l, r, v);
  }
  int get(int l, int r) {
    if (l > r) {
      return 0;
    }
    node nd = query(1, 0, n - 1, l, r);
    assert(nd.mn >= 0);
    return nd.mn == 0 ? nd.cnt : 0;
  }
};

template <typename T>
class fenwick {
  public:
  vector<T> fenw;
  int n;
  fenwick(int _n) : n(_n) {
    fenw.resize(n);
  }
  void modify(int x, T v) {
    while (x < n) {
      fenw[x] += v;
      x |= (x + 1);
    }
  }
  T get(int x) {
    T v{};
    while (x >= 0) {
      v += fenw[x];
      x = (x & (x + 1)) - 1;
    }
    return v;
  }
};

signed main() {
  ios::sync_with_stdio(false);
  cin.tie(0);  
  int n;
  cin >> n;
  vector<int> a(n);
  for (int i = 0; i < n; i++) {
    cin >> a[i];
  }
  fenwick<long long> fenw(n);
  for (int i = 0; i < n; i++) {
    fenw.modify(i, a[i]);
  }
  function<long long(int, int)> GetSum = [&](int L, int R) {
    return fenw.get(R) - fenw.get(L - 1);
  };
  const long long inf = (long long) 1e18;
  auto Valid = [&](int L, int R) {
    if (L + 1 >= R) {
      return false;
    }
    assert(L >= 0 || R < n);                                    
    return min((L < 0 ? inf : a[L] * 1LL), (R >= n ? inf : a[R] * 1LL)) > GetSum(L + 1, R - 1);
  };
  vector<vector<pair<int, int>>> segs(8 * n);
  function<void(int, int, int, int, int, int, int)> Add = [&](int x, int l, int r, int ll, int rr, int vl, int vr) {
    if (l > r || l > rr || r < ll || ll > rr) {
      return;
    }
    if (ll <= l && r <= rr) {
      segs[x].emplace_back(vl, vr);
      return;
    }
    int mid = l + r >> 1;
    Add(x * 2, l, mid, ll, rr, vl, vr);
    Add(x * 2 + 1, mid + 1, r, ll, rr, vl, vr);
  };               
  mncnt::init(n);
  mncnt::build(1, 0, n - 1);
  auto Build = [&]() {
    for (int i = 0; i < n; i++) {
      fenw.fenw[i] = 0;
    }
    for (int i = 0; i < n; i++) {
      fenw.modify(i, a[i]);
    }
    mncnt::init(n);
    mncnt::build(1, 0, n - 1);
    vector<int> stk;
    for (int i = 0; i < n; i++) {
      while (!stk.empty() && a[stk.back()] <= a[i]) {
        if (Valid(stk.back(), i)) {
          // cout << "Bad seg " << stk.back() + 1 << " " << i - 1 << '\n';
          //Add(1, 0, n - 1, max(0, stk.back()), i, stk.back() + 1, i - 1);
          mncnt::update(stk.back() + 1, i - 1, 1);
        }
        stk.pop_back();
      }
      if (stk.empty()) {
        if (Valid(-1, i)) {
          // cout << "Bad seg " << 0 << " " << i - 1 << '\n';
          //Add(1, 0, n - 1, 0, i, 0, i - 1);
          mncnt::update(0, i - 1, 1);
        }
      } else if (Valid(stk.back(), i)) {
        mncnt::update(stk.back() + 1, i - 1, 1);
      }
      stk.push_back(i);
    }
    stk.clear();
    for (int i = n - 1; i >= 0; i--) {
      while (!stk.empty() && a[stk.back()] <= a[i]) {
        if (Valid(i, stk.back())) {
          // cout << "Bad seg " << i + 1 << " " << stk.back() - 1 << '\n';
          //Add(1, 0, n - 1, i, min(n - 1, stk.back()), i + 1, stk.back() - 1);  
          mncnt::update(i + 1, stk.back() - 1, 1);
        }
        stk.pop_back();
      }
      if (stk.empty()) {
        if (Valid(i, n)) {
          // cout << "Bad seg " << i + 1 << " " << stk.back() - 1 << '\n';
          //Add(1, 0, n - 1, i, n - 1, i + 1, n - 1);
          mncnt::update(i + 1, n - 1, 1);
        }
      } else if (Valid(i, stk.back())) {
        mncnt::update(i + 1, stk.back() - 1, 1);
      }
      stk.push_back(i);
    }
  };
  int q;
  cin >> q;
  while (q--) {
    int op;
    cin >> op;
    if (op == 1) {
      int x, y;
      cin >> x >> y;
      --x;
      a[x] = y;    
    } else {
      Build();
      int l, r;
      cin >> l >> r;
      --l; --r;
      if (l == r) {
        cout << 1 << '\n';
        continue;
      }
      int L = l, R = r;
      {
        for (int i = L + 1; i <= R; i++) {
          if (GetSum(L, i - 1) < a[i]) {
            l = i;
          }
        }
      }
      {
        for (int i = R - 1; i >= L; i--) {
          if (GetSum(i + 1, R) < a[i]) {
            r = i;
          }
        }
      }
      assert(l <= r);
      //cout << l << " " << r << '\n';
      cout << mncnt::get(l, r) << '\n';
    }
  }
  return 0;
}

Compilation message

fish2.cpp: In function 'void mncnt::build(long long int, long long int, long long int)':
fish2.cpp:49:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   49 |     int mid = l + r >> 1;
      |               ~~^~~
fish2.cpp: In function 'void mncnt::update(long long int, long long int, long long int, long long int, long long int, long long int)':
fish2.cpp:65:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   65 |     int mid = l + r >> 1;
      |               ~~^~~
fish2.cpp: In function 'mncnt::node mncnt::query(long long int, long long int, long long int, long long int, long long int)':
fish2.cpp:81:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   81 |     int mid = l + r >> 1;
      |               ~~^~~
fish2.cpp: In lambda function:
fish2.cpp:157:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  157 |     int mid = l + r >> 1;
      |               ~~^~~

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 224 KB Output is correct
5 Incorrect 12 ms 516 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 69 ms 39464 KB Output is correct
3 Correct 70 ms 39380 KB Output is correct
4 Correct 76 ms 39460 KB Output is correct
5 Correct 79 ms 39464 KB Output is correct
6 Correct 59 ms 39436 KB Output is correct
7 Correct 45 ms 39376 KB Output is correct
8 Correct 59 ms 39460 KB Output is correct
9 Correct 44 ms 39464 KB Output is correct
10 Correct 54 ms 39392 KB Output is correct
11 Correct 63 ms 39464 KB Output is correct
12 Correct 72 ms 39492 KB Output is correct
13 Correct 58 ms 39456 KB Output is correct
14 Correct 81 ms 39468 KB Output is correct
15 Correct 82 ms 39504 KB Output is correct

Subtask #3
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 224 KB Output is correct
5 Incorrect 12 ms 516 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #4
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 69 ms 39464 KB Output is correct
3 Correct 70 ms 39380 KB Output is correct
4 Correct 76 ms 39460 KB Output is correct
5 Correct 79 ms 39464 KB Output is correct
6 Correct 59 ms 39436 KB Output is correct
7 Correct 45 ms 39376 KB Output is correct
8 Correct 59 ms 39460 KB Output is correct
9 Correct 44 ms 39464 KB Output is correct
10 Correct 54 ms 39392 KB Output is correct
11 Correct 63 ms 39464 KB Output is correct
12 Correct 72 ms 39492 KB Output is correct
13 Correct 58 ms 39456 KB Output is correct
14 Correct 81 ms 39468 KB Output is correct
15 Correct 82 ms 39504 KB Output is correct
16 Correct 0 ms 212 KB Output is correct
17 Execution timed out 4061 ms 39380 KB Time limit exceeded
18 Halted 0 ms 0 KB -

Subtask #5
0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 69 ms 39464 KB Output is correct
3 Correct 70 ms 39380 KB Output is correct
4 Correct 76 ms 39460 KB Output is correct
5 Correct 79 ms 39464 KB Output is correct
6 Correct 59 ms 39436 KB Output is correct
7 Correct 45 ms 39376 KB Output is correct
8 Correct 59 ms 39460 KB Output is correct
9 Correct 44 ms 39464 KB Output is correct
10 Correct 54 ms 39392 KB Output is correct
11 Correct 63 ms 39464 KB Output is correct
12 Correct 72 ms 39492 KB Output is correct
13 Correct 58 ms 39456 KB Output is correct
14 Correct 81 ms 39468 KB Output is correct
15 Correct 82 ms 39504 KB Output is correct
16 Correct 0 ms 212 KB Output is correct
17 Execution timed out 4082 ms 39468 KB Time limit exceeded
18 Halted 0 ms 0 KB -

Subtask #6
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 224 KB Output is correct
5 Incorrect 12 ms 516 KB Output isn't correct
6 Halted 0 ms 0 KB -