Submission #671803

#	Time	Username	Problem	Language	Result	Execution time	Memory
671803		viwlesxq	Money (IZhO17_money)	C++17	100 / 100	910 ms	51280 KiB

money

#include <bits/stdc++.h>
#include "ext/pb_ds/assoc_container.hpp"
#include "ext/pb_ds/tree_policy.hpp"

using namespace std;
using namespace __gnu_pbds;

typedef long long ll;
typedef string str;

#define pb push_back
#define pf push_front
#define ppb pop_back
#define ppf pop_front
#define F first
#define S second
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define sz(x) (int)x.size()
#define ordered_set tree<ll, null_type,less<ll>, rb_tree_tag,tree_order_statistics_node_update>
void freo(str x) {freopen((x + ".in").c_str(), "r", stdin);freopen((x + ".out").c_str(), "w", stdout);}
 
signed main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int n;
	cin >> n;
	int a[n];
	for (int i = 0; i < n; i++) cin >> a[i];
	int ans = 1;
	multiset <int> st;
	st.insert(a[0]);
	auto it = st.end();
	for (int i = 1; i < n; i++) {
		if (a[i] < a[i - 1]) {
			ans++;
			it = st.upper_bound(a[i]);
		}
		else {
			auto itu = st.upper_bound(a[i]);
			auto itl = st.lower_bound(a[i]);
			if (itu != it && itl != it) {
				ans++;
				it = itu;
			}
		}
		st.insert(a[i]);
	}
	cout << ans;
}

Compilation message (stderr)

money.cpp: In function 'void freo(str)':
money.cpp:21:26: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 | void freo(str x) {freopen((x + ".in").c_str(), "r", stdin);freopen((x + ".out").c_str(), "w", stdout);}
      |                   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
money.cpp:21:67: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 | void freo(str x) {freopen((x + ".in").c_str(), "r", stdin);freopen((x + ".out").c_str(), "w", stdout);}
      |                                                            ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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