Submission #343290

#	Time	Username	Problem	Language	Result	Execution time	Memory
343290		mehrdad_sohrabi	Split the sequence (APIO14_sequence)	C++14	100 / 100	1419 ms	83184 KiB

sequence

#include <bits/stdc++.h>
/// 500 485 462 A4
typedef long long int ll;
typedef long double ld;
#define pb push_back
#define pii pair < ll , ll >
#define F first
#define S second
#define endl '\n'
//#define int long long
#define sync ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math")
#define kill(x) return cout<<x<<'\n', 0;
using namespace std;
const int N=1e5+100,K=210;
ll par[N];
ll a[N];
ll dp[2][N];
int pd[K][N];
void solve(ll l,ll r,ll L,ll R,ll k){

    if (l>r) return ;
    ll mid=(r+l)/2;
    ll best=L,val=-1;
    for (int i=L;i<=min(mid,R);i++){
        if (val<(par[mid]-par[i-1])*(par[i-1])+dp[((k+1)&1)][i-1]){
            best=i;
            val=(par[mid]-par[i-1])*(par[i-1])+dp[((k+1)&1)][i-1];
        }
    }
    //cout << l << " " << r << " " << k << " " << best << " " << val << endl;
    dp[(k&1)][mid]=val;
    pd[k][mid]=best-1;
    solve(l,mid-1,L,best,k);
    solve(mid+1,r,best,R,k);
}
ll vis[N];
int32_t main(){
    sync;
    ll n,k;
    cin >> n >> k;
   // k++;
    for (int i=1;i<=n;i++){
        cin >> a[i];
        par[i]=par[i-1]+a[i];
    }
    for (int i=1;i<=k;i++){
        solve(i+1,n,1,n,i);
    }
    cout << dp[(k&1)][n] << endl;
    vector <int> ans;
    ll x=pd[k][n];
    ll zz=k;
    if (x>0)
    ans.pb(x);
    while(k!=1){
    //    cout << x << " " << k << endl;
        k--;
        x=pd[k][x];
        if (x<=0) break;
        ans.pb(x);
    }
    for (auto u : ans){
        vis[u]=1;
    }
    for (int i=1;i<=n;i++){
        if (!vis[i] && ans.size()<zz){
            ans.pb(i);
        }
    }
    sort(ans.begin(),ans.end());
   // reverse(ans.begin(),ans.end());
    for (auto u : ans) cout << u << " ";
    cout << endl;
}

Compilation message (stderr)

sequence.cpp: In function 'int32_t main()':
sequence.cpp:67:34: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'll' {aka 'long long int'} [-Wsign-compare]
   67 |         if (!vis[i] && ans.size()<zz){
      |                        ~~~~~~~~~~^~~

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