Submission #1083585

#	Time	Username	Problem	Language	Result	Execution time	Memory
1083585		f0rizen	K blocks (IZhO14_blocks)	C++17	100 / 100	192 ms	41988 KiB

blocks

#include <bits/stdc++.h>

using namespace std;
using ll = long long;
const int inf = 1e9 + 7;
const ll infll = 1e18;

template<typename T>
istream &operator>>(istream &is, vector<T> &a) {
    for (auto &i : a) {
        is >> i;
    }
    return is;
}

int32_t main() {
#ifdef LOCAL
    freopen("/tmp/input.txt", "r", stdin);
#else
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
#endif
    int n, k;
    cin >> n >> k;
    vector<int> a(n);
    cin >> a;
    vector<vector<int>> dp(k + 1, vector<int>(n + 1, inf));
    dp[0][0] = 0;
    for (int j = 1; j <= k; ++j) {
        vector<int> st, mn, pref;
        for (int i = 1; i <= n; ++i) {
            int cur = dp[j - 1][i - 1];
            while (!st.empty() && a[st.back()] <= a[i - 1]) {
                cur = min(cur, mn.back());
                st.pop_back();
                mn.pop_back();
                pref.pop_back();
            }
            st.push_back(i - 1);
            mn.push_back(cur);
            if (pref.empty()) {
                pref.push_back(cur + a[i - 1]);
            } else {
                pref.push_back(min(pref.back(), cur + a[i - 1]));
            }
            dp[j][i] = pref.back();
        }
    }
    cout << dp[k][n] << "\n";
    return 0;
}

• Subtask 1: 14 / 14
• Subtask 2: 18 / 18
• Subtask 3: 21 / 21
• Subtask 4: 47 / 47