#include<bits/stdc++.h>
using namespace std;
#define f first
#define s second
#define int long long
const int maxn = 1e5 + 69;
const int inf = 1e9;
int st[4 * maxn], n, k, a[maxn], dp[maxn], d[maxn];
void upd(int v, int tl, int tr, int p, int x) {
if (tl == tr)
st[v] = x;
else {
int mid = (tl + tr) / 2;
if (p <= mid)
upd(v * 2, tl, mid, p, x);
else
upd(v * 2 + 1, mid + 1, tr, p, x);
st[v] = min(st[v * 2], st[v * 2 + 1]);
}
}
int qry(int v, int tl, int tr, int l, int r) {
if (tl > r || tr < l)
return 1e9;
else if (tl >= l && tr <= r)
return st[v];
else {
int mid = (tl + tr) / 2;
return min(qry(v * 2, tl, mid, l, r), qry(v * 2 + 1, mid + 1, tr, l, r));
}
}
signed main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
int tt = 1;
//cin >> tt;
while (tt--) {
cin >> n >> k;
for (int i = 1;i <= n;i++)
cin >> a[i];
vector<int> st;
for (int i = 1;i <= n;i++) {
while (!st.empty() && a[st.back()] < a[i])
st.pop_back();
if (!st.empty())
d[i] = st.back();
st.push_back(i);
}
for (int j = 1;j <= k;j++) {
for (int i = 1;i <= n;i++)
upd(1, 1, n, i, dp[i]);
for (int i = 0;i <= n;i++) {
if (j > i)
dp[i] = inf;
else
dp[i] = min(dp[d[i]], qry(1, 1, n, d[i] + 1, i) + a[i]);
}
}
cout << dp[n];
}
return 0;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
4444 KB |
Output is correct |
| 2 |
Incorrect |
1 ms |
4444 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
4444 KB |
Output is correct |
| 2 |
Incorrect |
1 ms |
4444 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
4444 KB |
Output is correct |
| 2 |
Incorrect |
1 ms |
4444 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
4444 KB |
Output is correct |
| 2 |
Incorrect |
1 ms |
4444 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
