Submission #501422

#	Time	Username	Problem	Language	Result	Execution time	Memory
501422		nabpro	K blocks (IZhO14_blocks)	C++14	53 / 100	22 ms	18056 KiB

blocks

#include <bits/stdc++.h>
#define ll long long
using namespace std;
ll n,k,a[100005]={0},f[105][100005]={0};
int main()
{
    ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    //freopen("BLOCKS.INP","r",stdin);
    //freopen("BLOCKS.OUT","w",stdout);
    cin >> n>> k;
    for (ll i=1;i<=n;i++) cin >> a[i];
    for (ll i=1;i<=n;i++)
    {
        f[1][i]=max(f[1][i-1],a[i]);
    }
    for (ll i=2;i<=n;i++)
    {
        stack <pair <ll,ll>> q;
        for (ll j=i;j<=n;j++)
        {
            ll t=f[i-1][j-1];
            while (!q.empty() && q.top().first <a[j])
            {
                t=min(t,q.top().second);
                q.pop();
            }
            if (q.empty() || q.top().first + q.top().second > t +a[j])
            {
                q.push(make_pair(a[j],t));
            }
            f[i][j]=q.top().first + q.top().second;
        }
    }
    cout << f[k][n];
    return 0;
}

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