Submission #1060368

#	Time	Username	Problem	Language	Result	Execution time	Memory
1060368		0pt1mus23	K blocks (IZhO14_blocks)	C++14	100 / 100	132 ms	81168 KiB

blocks

#pragma GCC optimize("O3")
 
#include <bits/stdc++.h> 
using namespace std;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
#define ins insert
#define pb push_back
#define int long long int
#define pii pair<int, int>
#define endl '\n' 
#define drop(x) cout<<(x)<<endl; return;
#define all(x) x.begin(),x.end()
#define hash z0hashp
#define div  z0dvp
const int mod = 1e9 +7, sze = 1e6+23, inf = INT_MAX, P = 1453;
int dp[105][100005];
void opt1z(){ // https://codeforces.com/blog/entry/18866?#comment-238114
    int n,k;
    cin>>n>>k;
    vector<int> arr(n+1);
    int mx =0;
    for(int i=0;i<=n;i++){
        for(int j=0;j<=k;j++){
            dp[j][i]=inf;
        }
    }
    for(int i=1;i<=n;i++){
        cin>>arr[i];
        mx=max(mx,arr[i]);
        dp[1][i]=mx;
    }

    for(int i=2;i<=k;i++){
        stack<int> s1,s2;
        for(int j=1;j<=n;j++){
            int mdp = dp[i-1][j-1];
            while(!s1.empty() && s1.top() < arr[j]){
                mdp = min(mdp,s2.top());
                s1.pop();
                s2.pop();
            }
            if(s1.empty() || mdp + arr[j] < s1.top() + s2.top()){
                s1.push(arr[j]);
                s2.push(mdp);
            }
            if(j >= i){
                dp[i][j] = s1.top() + s2.top();
            }
        }
    }
    drop(dp[k][n]);
 
}
 
 
signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
 
    int tt = 1;
    // cin>>tt;
    while(tt--){
        opt1z();
    }
    return 0;
}

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