Submission #1365761

#TimeUsernameProblemLanguageResultExecution timeMemory
1365761avighnaRadio Towers (IOI22_towers)C++20
0 / 100
141 ms3096 KiB
#include <bits/stdc++.h>

using namespace std;

namespace {
int N;
vector<int> H;

using int64 = long long;

const int64 inf = 1e15;

class segment_tree {
  int n;
  vector<int64> seg;

public:
  segment_tree(int n) : n(n), seg(2 * n, -inf) {}

  void set(int i, int64 x) {
    for (seg[i += n] = x, i >>= 1; i > 0; i >>= 1) {
      seg[i] = max(seg[2 * i], seg[2 * i + 1]);
    }
  }

  int64 query(int l, int r) {
    int64 ans = -inf;
    for (l += n, r += n + 1; l < r; l >>= 1, r >>= 1) {
      if (l & 1) ans = max(ans, seg[l++]);
      if (r & 1) ans = max(ans, seg[--r]);
    }
    return ans;
  }
};

vector<int64> odd, even;
} // namespace

void init(int N, vector<int> H) {
  ::N = N, ::H = H;
  odd.resize(N), even.resize(N);
  for (int i = 0; i < N; ++i) {
    if (i % 2 == 0) {
      odd[i] = 1;
    } else {
      even[i] = 1;
    }
  }
  partial_sum(odd.begin(), odd.end(), odd.begin());
  partial_sum(even.begin(), even.end(), even.begin());
}

int max_towers(int L, int R, int D) {
  return 1;
  // vector<int> h;
  // for (int i = L; i <= R; ++i) {
  //   h.push_back(H[i]);
  // }
  // const int n = R - L + 1;
  // segment_tree st(n);
  // for (int i = 0; i < n; ++i) {
  //   st.set(i, h[i]);
  // }
  // vector<int> dp(n);
  // for (int i = 0; i < n; ++i) {
  //   dp[i] = 1;
  //   for (int j = 0; j + 1 <= i - 1; ++j) {
  //     int val = st.query(j + 1, i - 1) - D;
  //     if (h[i] <= val && h[j] <= val) {
  //       dp[i] = max(dp[i], dp[j] + 1);
  //     }
  //   }
  // }
  // return *max_element(dp.begin(), dp.end());
}
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