제출 #173466

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
173466		emil_physmath	Bigger segments (IZhO19_segments)	C++17	0 / 100	2 ms	380 KiB

segments

#include <algorithm>
#include <iostream>
#include <vector>
using namespace std;
typedef double ldouble;
typedef long long llong;
typedef unsigned int uint;

template<typename T1, typename T2>
ostream& operator<<(ostream& str, const pair<T1, T2>& p)
{
    return str << "{" << p.first << ", " << p.second << "}";
}
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    int n;
    cin >> n;
    vector<int> a(n);
    for (int& x: a)
        cin >> x;
    vector<llong> pref(n);
    for (int i = 0; i < n; ++i)
        pref[i] = a[i] + (i ? pref[i - 1] : 0);
    vector<pair<int, llong>> dp(n);
    for (int i = 0; i < n; ++i)
        dp[i] = {1, pref[i]};
    for (int i = 0; i < n; ++i)
    {
        int j = -1;
        int l = i + 1, r = n - 1;
        while (l <= r)
        {
            int m = (l + r) / 2;
            if (pref[m] - pref[i] >= dp[i].second)
            {
                j = m;
                r = m - 1;
            }
            else
                l = m + 1;
        }
        if (j != -1)
        {
            dp[j] = max(pair<int, llong>{dp[j].first, -dp[j].second}, {dp[i].first + 1, -(pref[j] - pref[i])});
            dp[j].second *= -1;
            // cerr << "i: " << i << "; " << "j: " << j << "\t" << dp[j] << endl;
        }
    }
    /*for (int i = 0; i < dp.size(); ++i)
        cerr << "dp[" << i << "] = " << dp[i] << endl;*/
    cout << max_element(dp.begin(), dp.end())->first << endl;
}

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