Submission #705411

#	Time	Username	Problem	Language	Result	Execution time	Memory
705411		pavement	Bigger segments (IZhO19_segments)	C++17	37 / 100	1563 ms	4160 KiB

segments

#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;
#define int long long
#define mp make_pair
#define mt make_tuple
#define pb push_back
#define ppb pop_back
#define eb emplace_back
#define g0(a) get<0>(a)
#define g1(a) get<1>(a)
#define g2(a) get<2>(a)
#define g3(a) get<3>(a)
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
using db = double;
using ll = long long;
using ld = long double;
using ii = pair<int, int>;
using iii = tuple<int, int, int>;
using iiii = tuple<int, int, int, int>;
template<class key, class value = null_type, class cmp = less<key> >
using ordered_set = tree<key, value, cmp, rb_tree_tag, tree_order_statistics_node_update>;

int n, a[500005], p[500005];
ii dp[500005];
vector<pair<int, ii> > container;

void upd(int p, ii v) {
	container.eb(p, v);
}

ii qry(int p) {
	ii ret = mp(-(int)1e16, -(int)1e16);
	for (auto [x, y] : container) {
		if (x <= p) ret = max(ret, y);
	}
	return ret;
}

main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	cin >> n;
	for (int i = 1; i <= n; i++) {
		cin >> a[i];
		p[i] = a[i] + p[i - 1];
		auto tmp = qry(p[i]);
		tmp.second -= p[i];
		dp[i] = max(mp(1ll, -p[i]), tmp);
		upd(p[i] - dp[i].second, mp(dp[i].first + 1, p[i]));
	}
	cout << dp[n].first << '\n';
}

Compilation message (stderr)

segments.cpp:42:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   42 | main() {
      | ^~~~

• Subtask 1: 13 / 13
• Subtask 2: 14 / 14
• Subtask 3: 10 / 10
• Subtask 4: 0 / 36
• Subtask 5: 0 / 27