Submission #1248398

#	Time	Username	Problem	Language	Result	Execution time	Memory
1248398		nguthianmangcay	K blocks (IZhO14_blocks)	C++20	14 / 100	1 ms	328 KiB

blocks

#include<bits/stdc++.h>
using namespace std;
const int N=1e5+3;
const int K=105;
const long long inf=1e18+3;
#define ll long long
#define fi first
#define se second
#define pi pair
ll a[N];
ll dp[K][N];
struct node
{
    ll m;
    ll b;
    ll d;
};
void jiangly()
{
    int n,k;
    cin>>n>>k;
    for(int i=1;i<=n;i++)
    {
        cin>>a[i];
    }
    for(int i=0;i<=k;i++)
    {
        for(int j=0;j<=n;j++)
        {
            dp[i][j]=inf;
        }
    }
    dp[0][0]=0;
    for(int t=1;t<=k;t++)
    {
        vector<node>v;
        v.push_back({0,dp[t-1][t-1],dp[t-1][t-1]});
        for(int i=1;i<=n;i++)
        {
            ll best=dp[t-1][i-1];
            while(!v.empty() && v.back().m <= a[i])
            {
                best=min(best,v.back().b);
                v.pop_back();
            }
            ll nmin=best+a[i];
            if(!v.empty())nmin=min(best+a[i],v.back().d);
            v.push_back({a[i],best,nmin});
            dp[t][i]=nmin;
        }
    }
    cout<<dp[k][n];
}
int main()
{
    cin.tie(0)->sync_with_stdio(0);
    if(fopen("QUANSENSEI.inp","r"))
    {
        freopen("O(0).inp","r",stdin);
    }
    jiangly();
}

Compilation message (stderr)

blocks.cpp: In function 'int main()':
blocks.cpp:59:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   59 |         freopen("O(0).inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

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