Submission #88638

#	Time	Username	Problem	Language	Result	Execution time	Memory
88638		ABCD	K blocks (IZhO14_blocks)	C++14	14 / 100	199 ms	45504 KiB

blocks

#include <bits/stdc++.h>
using namespace std;

const int N=1e5+5;
const int K=1e2+5;

typedef pair<int,int> ii;

int n,k;
int a[N];
int f[K][N];

void dp(){
    memset(f,1,sizeof(f));
    f[1][0]=0;
    for(int i=1;i<=n;i++) f[1][i]=max(f[1][i-1],a[i]);
    for(int i=2;i<=k;i++){
        stack<ii> st;
        for(int j=i;j<=n;j++){
            int tmp=f[i-1][j-1];
            while(st.size()&&a[st.top().first]<=a[j]){
                tmp=min(tmp,st.top().second);
                st.pop();
            }
            int p=st.size()?st.top().first:0;
            f[i][j]=min(f[i][p],tmp+a[j]);
            st.push({j,tmp});
        }
    }
    cout<<f[k][n];
}

main(){
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    cin>>n>>k;
    for(int i=1;i<=n;i++) cin>>a[i];
    dp();
}

Compilation message (stderr)

blocks.cpp:33:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^

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