Submission #107178

#	Time	Username	Problem	Language	Result	Execution time	Memory
107178		abil	Split the sequence (APIO14_sequence)	C++14	49 / 100	177 ms	132096 KiB

sequence

#include <bits/stdc++.h>
#define int long long
using namespace std;
const int N = (int)100007;
int n, k, arr[N], pr[N], par[N][207];
int dp1[N][3];
int calc(int l,int r){
      return pr[l] * (pr[r] - pr[l]);
}
void solve(int k,int l,int r,int optl,int optr){
      if(l > r){
            return;
      }
      int mid = (l + r) >> 1;
      int opt = optl;
      dp1[mid][k % 2] = 0;
      for(int i = optl;i <= min(mid,optr); i++){
            int cur = dp1[i][((k - 1) % 2)] + calc(i,mid);
            if(cur >= dp1[mid][k % 2]){
               dp1[mid][k % 2] = cur;
               opt = i;
            }
      }
      par[mid][k] = opt;
      solve(k,l,mid - 1,optl,opt);
      solve(k,mid + 1,r,opt,optr);
}
main(){
      cin >> n >> k;
      for(int i = 1;i <= n; i++){
            cin >> arr[i];
            pr[i] = pr[i - 1] + arr[i];
      }
      for(int i = 1;i <= k; i++){
            solve(i,1,n,1,n);
      }
      cout << dp1[n][k % 2] << '\n';
      vector<int > ans;
      while(par[n][k]){
            ans.push_back(par[n][k]);
            n = par[n][k];
            k--;
      }
      for(int i = ans.size() - 1; i >= 0; i--){
            cout << ans[i] << " ";
      }
}
/*
7 3
4 1 3 4 0 2 3
*/

Compilation message (stderr)

sequence.cpp:28:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^

• Subtask 1: 0 / 11
• Subtask 2: 11 / 11
• Subtask 3: 0 / 11
• Subtask 4: 17 / 17
• Subtask 5: 21 / 21
• Subtask 6: 0 / 29