Submission #1121090

#	Time	Username	Problem	Language	Result	Execution time	Memory
1121090		Icelast	K blocks (IZhO14_blocks)	C++17	0 / 100	1 ms	596 KiB

blocks

#include <iostream>
#include <bits/stdc++.h>
#define ll long long
using namespace std;
const ll maxn = 2*1e5+5, INF = 4e18+9;
void solve(){
    int n, k;
    cin >> n >> k;
    vector<ll> a(n+1);
    for(int i = 1; i <= n; i++){
        cin >> a[i];
    }
    vector<ll> f(n+1, INF), prv(n+1, INF);
    f[0] = 0;
    a[0] = INF;
    for(int j = 1; j <= k; j++){
        prv = f;
        fill(f.begin(), f.end(), INF);
        stack<pair<int, ll>> st;
        st.push({0, INF});
        for(int i = 1; i <= n; i++){
            while(!st.empty() && a[st.top().first] <= a[i]){
                st.pop();
            }
            int l = st.top().first;
            ll mn = st.top().second;
            st.push({i, min(mn, prv[max(l, j-1)]+a[i])});
            f[i] = st.top().second;
        }
    }
    cout << f[n];
}
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    solve();
}

• Subtask 1: 0 / 14
• Subtask 2: 0 / 18
• Subtask 3: 0 / 21
• Subtask 4: 0 / 47