이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
#define ll long long
#define lb lower_bound
#define pii pair<int,int>
#define pll pair<ll,ll>
#define F first
#define S second
#define ld long double
#define pb push_back
#define all(v) v.begin(),v.end()
#define in insert
#define sz(s) (int)s.size()
#define int ll
#define ppb pop_back
using namespace std;
const int MAX=2e5+10;
const int inf=2e9;
int n,k;
int a[MAX];
int dp[MAX][211];
int pr[MAX][211];
int p[MAX];
struct CHT{
vector<pii> vec;
vector<int> num;
int pos;
void init(){
pos=0;
vec.clear();
num.clear();
}
ld inter(pii a,pii b){
// cout<<b.F<<" "<<a.F<<"\n";
return (0.0+a.S-b.S)/(b.F-a.F);
}
void add(int k,int x,int i){
// cout<<k<<" "<<x<<"\n";
while(!vec.empty()&&vec.back().F==k){
if(vec.back().S<x){
vec.ppb();
num.ppb();
}
else{
return;
}
}
while(sz(vec)>=2&&inter(vec.back(),vec[sz(vec)-2])>=inter(vec[sz(vec)-2],{k,x})){
vec.ppb();
num.ppb();
}
vec.pb({k,x});
num.pb(i);
pos=min(pos,sz(vec)-1);
}
int get(pii a,int x){
return a.F*x+a.S;
}
int get(int X){
while(pos+1<sz(vec)&&get(vec[pos],X)<=get(vec[pos+1],X))pos++;
return get(vec[pos],X);
}
}C;
void solve(){
cin>>n>>k;
for(int i=1;i<=n;i++)cin>>a[i];
for(int i=1;i<=n;i++){
p[i]=p[i-1]+a[i];
dp[i][1]=0;
}
// for(int K=2;K<=k+1;K++){
// C.init();
// for(int i=K;i<=n;i++){
// C.add(p[i-1],dp[i-1][K-1]-p[i-1]*p[i-1],i-1);
// dp[i][K]=C.get(p[i]);
// pr[i][K]=C.num[C.pos];
// // cout<<i<<" "<<K<<" "<<pr[i][K]<<"\n";
// }
// }
cout<<dp[n][k+1]<<"\n";
// vector<int> ans;
// int cur=n;
// while(k>=0){
// ans.pb(cur);
// cur=pr[cur][(k+1)];
// k--;
// }
// sort(all(ans));
// ans.ppb();
// for(int x:ans){
// cout<<x;
// if(x!=ans.back())cout<<" ";
// }
}
// #ifdef LOCAL
signed main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int t=1;
// cin>>t;
while(t--)solve();
}
// #endif
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