oj.uz

Submission #815745

# Submission time Handle Problem Language Result Execution time Memory
815745 2023-08-08T20:35:14 Z MilosMilutinovic Fish 2 (JOI22_fish2) C++14
8 / 100
 4000 ms 39464 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) {
    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);
      return;      
    }
    push(x);
    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) {
      return {(int) 1e9, 0};
    }
    if (ll <= l && r <= rr) {
      return st[x];
    }
    push(x);
    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;
    }                                                   
    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);
  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::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);
        }
      }
      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);
        }
      }
      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;
      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:47:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   47 |     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:63:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   63 |     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:76:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   76 |     int mid = l + r >> 1;
      |               ~~^~~
fish2.cpp: In lambda function:
fish2.cpp:151:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  151 |     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 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Incorrect 5 ms 468 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 50 ms 39464 KB Output is correct
3 Correct 58 ms 39380 KB Output is correct
4 Correct 51 ms 39376 KB Output is correct
5 Correct 51 ms 39444 KB Output is correct
6 Correct 43 ms 39464 KB Output is correct
7 Correct 38 ms 39424 KB Output is correct
8 Correct 44 ms 39460 KB Output is correct
9 Correct 37 ms 39452 KB Output is correct
10 Correct 52 ms 39460 KB Output is correct
11 Correct 49 ms 39404 KB Output is correct
12 Correct 41 ms 39384 KB Output is correct
13 Correct 40 ms 39464 KB Output is correct
14 Correct 48 ms 39368 KB Output is correct
15 Correct 57 ms 39356 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 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Incorrect 5 ms 468 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 50 ms 39464 KB Output is correct
3 Correct 58 ms 39380 KB Output is correct
4 Correct 51 ms 39376 KB Output is correct
5 Correct 51 ms 39444 KB Output is correct
6 Correct 43 ms 39464 KB Output is correct
7 Correct 38 ms 39424 KB Output is correct
8 Correct 44 ms 39460 KB Output is correct
9 Correct 37 ms 39452 KB Output is correct
10 Correct 52 ms 39460 KB Output is correct
11 Correct 49 ms 39404 KB Output is correct
12 Correct 41 ms 39384 KB Output is correct
13 Correct 40 ms 39464 KB Output is correct
14 Correct 48 ms 39368 KB Output is correct
15 Correct 57 ms 39356 KB Output is correct
16 Correct 0 ms 212 KB Output is correct
17 Execution timed out 4074 ms 39420 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 50 ms 39464 KB Output is correct
3 Correct 58 ms 39380 KB Output is correct
4 Correct 51 ms 39376 KB Output is correct
5 Correct 51 ms 39444 KB Output is correct
6 Correct 43 ms 39464 KB Output is correct
7 Correct 38 ms 39424 KB Output is correct
8 Correct 44 ms 39460 KB Output is correct
9 Correct 37 ms 39452 KB Output is correct
10 Correct 52 ms 39460 KB Output is correct
11 Correct 49 ms 39404 KB Output is correct
12 Correct 41 ms 39384 KB Output is correct
13 Correct 40 ms 39464 KB Output is correct
14 Correct 48 ms 39368 KB Output is correct
15 Correct 57 ms 39356 KB Output is correct
16 Correct 0 ms 212 KB Output is correct
17 Execution timed out 4085 ms 39364 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 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Incorrect 5 ms 468 KB Output isn't correct
6 Halted 0 ms 0 KB -