Submission #651073

#	Time	Username	Problem	Language	Result	Execution time	Memory
651073		Shin	Money (IZhO17_money)	C++14	100 / 100	160 ms	15032 KiB

money

#include <bits/stdc++.h>
#define fi first
#define se second
#define mp make_pair

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;
}

signed main() {
  cin.tie(0)->sync_with_stdio(0);
  int n; cin >> n;
  vector<int> a(n + 7);
  for (int i = 1; i <= n; i ++) {
    cin >> a[i];
  }

  vector<int> f((int) 1e6 + 7);

  auto modify = [&](int i, int v) {
    for (; i <= (int) 1e6; i += i & -i) {
      f[i] += v;
    }
  };

  auto get = [&](int i) {
    int res = 0;
    for (; i; i -= i & - i) {
      res += f[i];
    }
    return res;
  };

  int res = 1, last = 0;
  vector<int> save;
  for (int i = 1; i <= n; i ++) {
    save.push_back(a[i]);
    if (a[i] < a[i - 1]) {
      for (int x: save) {
        modify(x, 1);
      }
      save.clear();
      last = a[i];
      res ++;
    } else
    if (a[i] > a[i - 1]) {
      if (get(a[i] - 1) - get(last) > 0) {
        res ++;
        for (int x: save) {
          modify(x, 1);
        }
        save.clear();
        last = a[i];
      }
    }
  }
  cout << res;
  return 0;
}

• Subtask 1: 9 / 9
• Subtask 2: 16 / 16
• Subtask 3: 20 / 20
• Subtask 4: 55 / 55