제출 #851516

#제출 시각아이디문제언어결과실행 시간메모리
851516NeroZeinBigger segments (IZhO19_segments)C++17
0 / 100
4 ms8796 KiB
#include "bits/stdc++.h" using namespace std; #ifdef Nero #include "Deb.h" #else #define deb(...) #endif const int N = 5e5 + 5; int a[N], f[N]; long long pref[N]; pair<int, long long> dp[N]; int main(){ ios::sync_with_stdio(false); cin.tie(nullptr); int n; cin >> n; for (int i = 1; i <= n; ++i) { cin >> a[i]; pref[i] = pref[i - 1] + a[i]; } dp[1] = {1, a[1]}; f[1] = 1; for (int i = 2; i <= n; ++i) { bool c = false; for (int j = i - 1; j >= 0; --j) { if (j > 0) { assert(dp[j].second + pref[j] >= dp[j - 1].second + pref[j - 1]); } if (dp[j].second <= pref[i] - pref[j]) { c = true; dp[i].first = dp[j].first + 1; dp[i].second = pref[i] - pref[j]; break; } } if (!c) { dp[i] = dp[i - 1]; dp[i].second += a[i]; } } cout << dp[n].first << '\n'; return 0; }
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