Submission #585664

#	Time	Username	Problem	Language	Result	Execution time	Memory
585664		Shin	Divide and conquer (IZhO14_divide)	C++14	100 / 100	52 ms	8628 KiB

divide

#include <bits/stdc++.h>
#define fi first
#define se second
#define mp make_pair
#define all(x) x.begin(), x.end()

using namespace std;
template <class X, class Y> bool minimize(X &a, Y b) {
    if (a > b) return a = b, true;
    return false;
}
template <class X, class Y> bool maximize(X &a, Y b) {
    if (a < b) return a = b, true;
    return false;
}

struct items {
  int x;
  long long g, d;
  items() {
    d = g = x = 0;
  }
};

struct segment_tree {
  vector<long long> mx;
  int n;
  segment_tree(int _n) : n(_n) {
    mx.assign((n << 2) + 7, -(long long) 1e18);
  }
  void modify(int id, int l, int r, int p, long long v) {
    if (l > p || r < p) {
      return;
    }
    if (l == r) {
      mx[id] = v;
    } else {
      int mid = (l + r) >> 1;
      modify(id << 1, l, mid, p, v);
      modify(id << 1|1, mid + 1, r, p, v);
      mx[id] = max(mx[id << 1], mx[id << 1|1]);
    }
  }
  int get(int id, int l, int r, long long k) {
    if (l == r) {
      return (mx[id] < k ? -1: l);
    }
    int mid = (l + r) >> 1;
    if (mx[id << 1] >= k) {
      return get(id << 1, l, mid, k);
    }
    return get(id << 1|1, mid + 1, r, k);
  }
  void modify(int p, int v) {
    modify(1, 1, n, p, v);
  }
  int get(long long k) {
    return get(1, 1, n, k);
  }
};
const int N = 1e5 + 7;
int n;
items a[N];

signed main() {
  cin.tie(0)->sync_with_stdio(0);
  cin >> n;
  for (int i = 1; i <= n; i ++) {
    cin >> a[i].x >> a[i].g >> a[i].d;
    a[i].g += a[i - 1].g;
    a[i].d += a[i - 1].d;
  }
  long long res = 0;
  segment_tree st(n);
  for (int i = 1; i <= n; i ++) {
    st.modify(i, a[i].x - a[i - 1].d);
    int pos = st.get(a[i].x - a[i].d);
    if (pos != -1) {
      maximize(res, a[i].g - a[pos - 1].g);
    }
  }
  cout << res;
  return 0;
}

• Subtask 1: 17 / 17
• Subtask 2: 31 / 31
• Subtask 3: 52 / 52