#include <bits/stdc++.h>
using namespace std;
const int mxn = 100 * 1000 + 3;
int seg[2 * mxn], l[mxn], r[mxn], a[mxn], p[mxn], dp[mxn][103], n, k, mx = 0;
signed main() {
std::ios::sync_with_stdio(0);
std::cout.tie(0);
std::cin.tie(0);
#ifdef saarang
freopen("/home/saarang/Documents/cp/input.txt", "r", stdin);
freopen("/home/saarang/Documents/cp/output.txt", "w", stdout);
#endif
cin >> n >> k;
for(int i = 0; i <= n; i++)
for(int j = 0; j <= n; j++)
dp[i][j] = 1e9;
for(int i = 1; i <= n; i++) {
cin >> a[i];
l[i] = r[i] = i;
l[i] = r[i] = i;
mx = max(mx, a[i]);
dp[1][i] = mx;
}
stack<int> s;
for(int i = 1; i <= n; i++) {
while(!s.empty() && a[s.top()] <= a[i])
s.pop();
l[i] = s.empty() ? 1 : s.top() + 1;
s.push(i);
}
while(!s.empty()) s.pop();
for(int i = n; i; i--) {
while(!s.empty() && a[s.top()] <= a[i])
s.pop();
r[i] = s.empty() ? n : s.top() - 1;
s.push(i);
}
// for(int i = 1; i <= n; i++)
// cout << l[i] << ' ' << r[i] << '\n';
auto query = [&] (int i, int j) {
int res = 1e9;
i = max(1, i);
if(i > j) return res;
for(i += n - 1, j += n; i < j; i >>= 1, j >>= 1) {
if(i & 1)
res = min(res, seg[i++]);
if(j & 1)
res = min(res, seg[--j]);
}
return res;
};
for(int i = 2; i <= k; i++) {
for(int j = 1; j <= n; j++)
seg[n + j - 1] = dp[i - 1][j];
for(int j = n - 1; j > 0; j--)
seg[j] = min(seg[j << 1], seg[j << 1|1]);
for(int j = i; j <= n; j++)
dp[i][j] = a[j] + query(l[j] - 1, j - 1);
}
// for(int i = 1; i <= k; i++) {
// for(int j = 1; j <= n; j++)
// cout << dp[i][j] << ' ';
// cout << '\n';
// }
cout << dp[k][n] << '\n';
return 0;
Compilation message
blocks.cpp: In function 'int main()':
blocks.cpp:67:13: error: expected '}' at end of input
67 | return 0;
| ^
blocks.cpp:6:15: note: to match this '{'
6 | signed main() {
| ^
