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>
using namespace std;
int n,k;
long long a[400000];
long long m[400000];
long long mincnt=0;
long long score=0;
long long get(int ind) {
if(ind<0)return 0;
else return m[ind];
}
void calc(long long lam) {
long long bestscore=0;
long long bestcnt=0;
long long bestnxt=-lam;
long long nxtcnt=0;
for(int i=0;i<n;i++) {
if(bestscore-lam-get(i-1)>bestnxt ||
(bestscore-lam-get(i-1)==bestnxt && nxtcnt>bestcnt)) {
bestnxt=bestscore-get(i-1)-lam;
nxtcnt=bestcnt;
}
if(bestnxt+get(i)>bestscore || (bestnxt+get(i)==bestscore && nxtcnt+1<bestcnt)) {
bestscore=bestnxt+get(i);
bestcnt=nxtcnt+1;
}
}
mincnt=bestcnt;
score=bestscore;
}
int main() {
cin>>n>>k;
for(int i=0;i<n;i++)cin>>a[i];
m[0]=a[0];for(int i=1;i<n;i++)m[i]=m[i-1]+a[i];
long long l=0,r=1e17;
while(l+1<r) {
long long mid=(l+r)/2;
calc(mid);
if(mincnt<k)r=mid;
else l=mid;
}
calc(r);
cout<<score+k*r<<endl;
return 0;
}
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