Submission #671797

#	Time	Username	Problem	Language	Result	Execution time	Memory
671797		viwlesxq	Money (IZhO17_money)	C++17	0 / 100	0 ms	212 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;
	vector <int> cur;
	cur.pb(a[0]);
	set <int> st;
	for (int i = 1; i < n; i++) {
		if (a[i] < cur.back()) {
			ans++;
			for (int j : cur) st.insert(j);
			cur.clear();
			cur.pb(a[i]);
		}
		else {
			auto it = st.lower_bound(cur.back());
			if (it != st.end() && *it < a[i]) {
				ans++;
				for (int j : cur) st.insert(j);
				cur.clear();
				cur.pb(a[i]);
			}
			else cur.pb(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: 0 / 9
• Subtask 2: 0 / 16
• Subtask 3: 0 / 20
• Subtask 4: 0 / 55