This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
const int nx=1e5+5, kx=105;
int n, k, v[nx], dp[kx][nx], x, mx;
struct segtree
{
int d[4*nx], lz[4*nx];
void pushlz(int l, int r, int i)
{
d[i]+=lz[i];
if (l==r) return void(lz[i]=0);
d[2*i]+=lz[i];
d[2*i+1]+=lz[i];
lz[i]=0;
}
void build(int l, int r, int i, int ly)
{
lz[i]=0;
if (l==r) return void(d[i]=l<=1?1e9:dp[ly][l-1]);
int md=(l+r)/2;
build(l, md, 2*i, ly);
build(md+1, r ,2*i+1, ly);
d[i]=min(d[2*i], d[2*i+1]);
}
void update(int l, int r, int i, int ql, int qr, int vl)
{
pushlz(l, r, i);
if (qr<l||r<ql) return;
if (ql<=l&&r<=qr) return d[i]+=vl, pushlz(l, r, i), void();
int md=(l+r)/2;
update(l, md, 2*i, ql, qr, vl);
update(md+1, r, 2*i+1, ql, qr, vl);
d[i]=min(d[2*i], d[2*i+1]);
}
int query(int l, int r, int i, int ql, int qr)
{
pushlz(l, r, i);
if (r<ql||qr<l) return INT_MAX;
if (ql<=l&&r<=qr) return d[i];
int md=(l+r)/2;
return min(query(l, md, 2*i, ql, qr), query(md+1, r, 2*i+1, ql, qr));
}
} s;
int main()
{
cin.tie(NULL)->sync_with_stdio(false);
cin>>n>>k;
v[0]=1e9;
for (int i=1; i<=n; i++) cin>>v[i], mx=max(mx, v[i]), dp[1][i]=mx;
for (int i=2; i<=k; i++)
{
stack<int> st;
st.push(0);
s.build(1, n, 1, i-1);
for (int j=1; j<=n; j++)
{
while (st.size()>=2&&v[st.top()]<=v[j]) x=st.top(), st.pop(), s.update(1, n, 1, st.top()+1, x, -v[x]);
s.update(1, n, 1, st.top()+1, j, v[j]);
dp[i][j]=s.query(1, n, 1, 1, j);
st.push(j);
//cout<<i<<' '<<j<<' '<<dp[i][j]<<'\n';
}
}
cout<<dp[k][n];
}
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