Submission #1166058

#	Time	Username	Problem	Language	Result	Execution time	Memory
1166058		escobrand	K blocks (IZhO14_blocks)	C++20	0 / 100	1 ms	328 KiB

blocks

#include <bits/stdc++.h>

using namespace std;
#define all(v) v.begin(),v.end()
#define eb push_back
#define ll long long
#define fi first
#define se second
int t,n,i,k,j;
const int maxn = 1e6 + 10,maxk = 110;
int a[maxn],dp[maxn][maxk];
stack<pair<int,int>> st[maxk];
multiset<int> s[maxk];
vector<pair<int,int>> v[maxk];
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    cin>>n>>k;

    for(i = 1;i<=k;i++)
    {
      s[i].insert(1e9+500);
      dp[0][i] = 1e9+500;
      st[i].push({1e9+500,0});
      v[i].eb({0,1e9 + 500});
    }
    s[0].insert(0);

    for(i = 1;i<=n;i++)
    {
      dp[i][0] = 1e9 + 500;
      cin>>a[i];

      for(j = 1;j<=k;j++)
      {
        dp[i][j] = 1e9 + 500;
        if(j <= i)
        {
          while(st[j].top().fi <= a[i] && st[j].top().se >= j)
          {
            auto it = s[j].find(dp[st[j].top().se][j]);
            if(it != s[j].end())s[j].erase(it);
            st[j].pop();
          }

          auto it = lower_bound( all(v[j-1]) , make_pair(st[j].top().se+1,0) );
          if(it != v[j-1].end())dp[i][j] = min(dp[i][j], it->se + a[i]);

          dp[i][j] = min({dp[i][j], dp[ st[j].top().se ][ j - 1 ] + a[i], *s[j].begin() });

          s[j].insert(dp[i][j]);
        }

        st[j].push({a[i],i});
        while(v[j].back().fi < i && v[j].back().se >= dp[i][j])v[j].pop_back();
        v[j].eb({i,dp[i][j]});
      }
    }

    // for(j = 0;j<=k;j++)
    // {
    //   for(i = 0;i<=n;i++)
    //   {
    //     cout<<(dp[i][j] >= 1e9 ? -1 : dp[i][j])<<' ';
    //   }
    //   cout<<'\n';
    // }

    cout<<dp[n][k];
    return 0;
}

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