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;
#define int long long
int n, k, a[100005], dp[2][100005], val[100005], pfs[100005], trace[205][100005], pfs2[100005];
int cost(int l, int r) {
return (pfs2[r] - pfs2[l-1]) * (pfs2[n] - pfs2[r]);
//return pfs[r] - pfs[l - 1] - pfs2[l - 1] * (r - l + 1);
}
void solve(int l, int r, int opl, int opr, int k) {
int mid = (l + r) / 2, res = -1, pos;
for (int i = opl; i <= min(mid, opr); i++) if(i >= k) {
int val = dp[k&1^1][i - 1] + cost(i, mid);
if(res < val) {
res = val;
pos = i;
}
}
dp[k&1][mid] = res;
trace[k][mid] = pos - 1;
if(l < mid) solve(l, mid-1, opl, pos, k);
if(mid < r) solve(mid + 1, r, pos, opr, k);
}
signed main() {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
cin >> n >> k; ++k;
for (int i = 1; i <= n; i++) {
cin >> a[i];
pfs2[i] = pfs2[i - 1] + a[i];
}
for (int i = 1; i <= n; i++) {
dp[0][i] = -1;
}
for (int i = 1; i <= k; i++){
memset(dp[i%2], -1, sizeof(dp[i%2]));
solve(i, n, 1, n, i);
}
cout << dp[k%2][n] << endl;
vector<int> ans;
int p = n;
for(int i = k; i > 1; i--){
p = trace[i][p]; ans.push_back(p);
}
reverse(ans.begin(), ans.end());
for(int i : ans) cout<<i<<" ";
}
Compilation message (stderr)
sequence.cpp: In function 'void solve(long long int, long long int, long long int, long long int, long long int)':
sequence.cpp:16:23: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
16 | int val = dp[k&1^1][i - 1] + cost(i, mid);
| ~^~
sequence.cpp:23:25: warning: 'pos' may be used uninitialized in this function [-Wmaybe-uninitialized]
23 | trace[k][mid] = pos - 1;
| ~~~~^~~
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