# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
1239137 | MasterDebater | K blocks (IZhO14_blocks) | C++20 | 1093 ms | 5704 KiB |
#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<ll,ll>
#define F first
#define S second
const int N=1e5+10,off=(1<<17),INF=1e18;
ll n,k,a[N],dp[N][2];
vector<pii>v;
multiset<ll>s;
int main(){
ios_base::sync_with_stdio(false);
cin.tie(0);
cin>>n>>k;
for(int i=0;i<n;i++)cin>>a[i];
for(int i=0;i<n;i++){
if(i==0)dp[i][0]=a[i];
else dp[i][0]=max(dp[i-1][0],a[i]);
}
for(int j=1;j<k;j++){
//cout<<"------------------\n";
v.clear();
v.push_back({dp[j-1][0],0});
s.clear();
s.insert(dp[j-1][0]);
for(int i=j;i<n;i++){
//cout<<i<<'\n';
ll zd=INF;
while(!v.empty() and v.back().S<a[i]){
//cout<<v.back().F<<' '<<v.back().S<<'\n';
pii nxt=v.back();
v.pop_back();
zd=min(zd,nxt.F);
s.erase(s.find(nxt.F+nxt.S));
}
if(zd!=INF){
v.push_back({zd,a[i]});
s.insert(zd+a[i]);
}
dp[i][1]=(*s.begin());
v.push_back({dp[i][0],0});
s.insert(dp[i][0]);
}
for(int i=0;i<n;i++)dp[i][0]=dp[i][1];
//for(int i=0;i<n;i++)cout<<dp[i][0]<<' ';
//cout<<'\n';
}
cout<<dp[n-1][0];
return 0;
}
Compilation message (stderr)
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