Submission #1166026

#	Time	Username	Problem	Language	Result	Execution time	Memory
1166026		LmaoLmao	K blocks (IZhO14_blocks)	C++20	0 / 100	1 ms	584 KiB

blocks

#include<bits/stdc++.h>
#define fi first
#define se second
#define int long long
using namespace std;

using ll = long long;
using ii = pair<ll, ll>;
using aa = array<int,3>;

const int N = 1e6+5;
const int INF = 1e9;

int dp[100005][105];
int op[100005][105];
int a[100005];

int tshirt(int L,int R,int cur) {
    int l=L,r=R;
    int res=dp[l][cur];
    if(L==R) return res;
    while(l<=r) {
        int m=(l+r)/2;
        if(m==L) {
            if(dp[m][cur]>dp[m+1][cur]) {
                l=m+1;
            } else return dp[m][cur];
        } else
        if(m==R) {
            if(dp[m][cur]>dp[m-1][cur]) {
                r=m-1;
            } else return dp[m][cur];
        } else
        if(dp[m][cur]<=dp[m+1][cur] && dp[m][cur]<=dp[m-1][cur]) {
            return dp[m][cur];
        }
        if(dp[m][cur]>dp[m+1][cur]) {
            l=m+1;
        }
        else {
            r=m-1;
        }
    }
}

signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int n,k;
    cin >> n >> k;
    for(int i=1;i<=n;i++) {
        cin >> a[i];
        dp[i][0]=1e18;
    }
    for(int j=1;j<=k;j++) {
        stack<int> st;
        dp[j-1][j]=1e18;
        op[j-1][j]=1e18;
        for(int i=j;i<=n;i++) {
            if(i<j) {
                cout << -1 << ' ';
                continue;
            }
            while(!st.empty() && a[i]>=a[st.top()]) {
                st.pop();
            }
            int pos;
            if(st.empty()) {
                dp[i][j]=op[i-1][j-1]+a[i];
            }
            else {
                pos=st.top();
                dp[i][j]=min(tshirt(pos,i-1,j-1)+a[i],dp[pos][j]);
            }
            st.push(i);
            //cout << pos << ' ';
            //cout << dp[i][j] << ' ';
            op[i][j]=min(op[i-1][j],dp[i][j]);
        }
        //cout << endl;
    }
    cout << dp[n][k];
    return 0;
}

Compilation message (stderr)

blocks.cpp: In function 'long long int tshirt(long long int, long long int, long long int)':
blocks.cpp:44:1: warning: control reaches end of non-void function [-Wreturn-type]
   44 | }
      | ^

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