Submission #678422

#	Time	Username	Problem	Language	Result	Execution time	Memory
678422		YENGOYAN	Bigger segments (IZhO19_segments)	C++17	0 / 100	1 ms	316 KiB

segments

/*
	//\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\\
	\\                                    //
	//  271828___182845__904523__53602__  \\
	\\  87___47____13______52____66__24_  //
	//  97___75____72______47____09___36  \\
	\\  999595_____74______96____69___67  //
	//  62___77____24______07____66__30_  \\
	\\  35___35____47______59____45713__  //
	//                                    \\
	\\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\//
												*/

#include <iostream>
#include <vector>
#include <set>
#include <map>
#include <unordered_map>
#include <unordered_map>
#include <cmath>
#include <climits>
#include <algorithm>
#include <random>
#include <queue>
#include <deque>
#include <iomanip>
#include <string>
#include <tuple>
#include <bitset>
#include <chrono>
#include <ctime>
#include <fstream>
#include <stack>
#include <cstdio>

using namespace std;
using ll = long long;
const int N = 3e5 + 5;
const ll mod = 1e9 + 7, inf = 1e12;

void solve() {	
	int n; cin >> n;
	vector<ll> v(n), pref(n + 1);
	for (int i = 0; i < n; ++i) {
		cin >> v[i];
		pref[i + 1] = pref[i] + v[i];
	}
	vector<vector<pair<ll, ll>>> dp(n + 1, vector<pair<ll, ll>>(n + 1, {0, 0}));
	for (int l = 1; l <= n; ++l) {
		for (int r = l; r <= n; ++r) {
			dp[l][r] = max(dp[l][r], { dp[l][r - 1].first, -(-dp[l][r - 1].second + v[r - 1]) });
			if (r == l) dp[l][r] = { 1, -v[r - 1] };
			//cout << dp[1][1].first << "\n";
			ll cnt = dp[l][r].first, sm = -dp[l][r].second;
			ll req = pref[r] + sm;
			//if(sm < 0) cout << l << " " << r << "\n";
			int id = lower_bound(pref.begin(), pref.end(), req) - pref.begin();
			if (id > n) continue;
			if (sm >= 0 && pref[id] < sm) cout << "E AP JAN STE KLYUCHNIK CHKA ES CHEM JOGE?\n";
			if(id >= r) dp[l][id] = max(dp[l][id], { cnt + 1, -(pref[id] - sm) });
		}
	}
	/*for (int i = 1; i <= n; ++i) {
		for (int j = 1; j <= n; ++j) {
			cout << dp[i][j].first << " ";
		}
		cout << "\n";
	}*/
	cout << dp[1][n].first << "\n";
}

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(NULL);
	//int t; cin >> t;
	//while (t--) 
	solve();
}

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