Submission #668950

#	Time	Username	Problem	Language	Result	Execution time	Memory
668950		Dan4Life	Split the sequence (APIO14_sequence)	C++17	33 / 100	2077 ms	13412 KiB

sequence

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define pb push_back
#define all(a) a.begin(),a.end()
#define mp make_pair
#define fi first
#define se second
 
const int maxn = (int)1e3+10;
int n, K, a[maxn];
int pre[maxn];
unordered_map<int,unordered_map<int,int>> dp[maxn];
unordered_map<int,unordered_map<int,int>> p[maxn];
vector<int> v;
int sum(int i, int j) {return pre[j+1]-pre[i];}
 
int recur(int l, int r, int k){
    if(r-l+1<=k or !k) return 0;
    if(dp[l].count(r) and dp[l][r].count(k)) return dp[l][r][k];
    int ans = 0;
    for(int x = l; x < r; x++){
        if(r-(x+1)+1 <=k-1) break;
        int tot = recur(x+1,r,k-1)+sum(l,x)*sum(x+1,r);
        if(ans < tot) ans=tot, p[l][r][k]=x;
    }
    return dp[l][r][k]=ans;
}
 
void recur2(int l, int r, int k){
    if(r-l+1<=k or !k) return;
    v.pb(p[l][r][k]); recur2(p[l][r][k]+1,r,k-1);
}
 
int32_t main()
{
    ios_base::sync_with_stdio(false); cin.tie(0);
    cin >> n >> K; //memset(dp,-1,sizeof(dp));
    for(int i = 0; i < n; i++) cin >> a[i], pre[i+1]=pre[i]+a[i];
    cout << recur(0,n-1,K) << "\n"; recur2(0,n-1,K);
    sort(all(v)); for(auto u : v) cout << u+1 << " ";
}

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