結果
| 問題 | 
                            No.1117 数列分割
                             | 
                    
| コンテスト | |
| ユーザー | 
                             theory_and_me
                         | 
                    
| 提出日時 | 2020-07-18 02:01:55 | 
| 言語 | C++17  (gcc 13.3.0 + boost 1.87.0)  | 
                    
| 結果 | 
                             
                                AC
                                 
                             
                            
                         | 
                    
| 実行時間 | 2,135 ms / 3,000 ms | 
| コード長 | 3,736 bytes | 
| コンパイル時間 | 2,191 ms | 
| コンパイル使用メモリ | 206,652 KB | 
| 最終ジャッジ日時 | 2025-01-11 23:44:43 | 
| 
                            ジャッジサーバーID (参考情報)  | 
                        judge3 / judge4 | 
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| ファイルパターン | 結果 | 
|---|---|
| sample | AC * 3 | 
| other | AC * 26 | 
ソースコード
#include <bits/stdc++.h>
using namespace std;
typedef unsigned long long ull;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<double, double> pdd;
typedef vector<ll> vl;
typedef vector<vector<ll>> vvl;
//typedef vector<vector<ll>> Graph;
const ll mod = 1e9 + 7;
//const ll mod = 998244353;
#define REP(i,n) for(ll i=0;i<(ll)n;i++)
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define spa << " " <<
#define fi first
#define se second
template<class T> bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T> bool chmin(T &a, const T &b) { if (a>b) { a=b; return 1; } return 0; }
template<class S, class T> ostream& operator << (ostream& os, const pair<S, T> v){
os << "(" << v.first << ", " << v.second << ")"; return os;
}
template<class T> ostream& operator << (ostream& os, const vector<T> v){
for(int i = 0; i < (int)v.size(); i++){if(i > 0){os << " ";} os << v[i];} return os;
}
template<class T> ostream& operator << (ostream& os, const vector<vector<T>> v){
for(int i = 0; i < (int)v.size(); i++){if(i > 0){os << endl;} os << v[i];} return os;
}
template<typename T> void debug(vector<vector<T>>&v,ll h,ll w){for(ll i=0;i<h;i++)
{cerr<<v[i][0];for(ll j=1;j<w;j++)cerr spa v[i][j];cerr<<endl;}};
template<typename T> void debug(vector<T>&v,ll n){if(n!=0)cerr<<v[0];
for(ll i=1;i<n;i++)cerr spa v[i];
cerr<<endl;};
template <class T, class Op> class queue_aggregation {
private:
  class node {
  public:
    T val, sum;
    node(const T &val, const T &sum) : val(val), sum(sum) {}
  };
  Op op;
  std::stack<node> front_stack, back_stack;
public:
  queue_aggregation(const Op &op = Op())
      : op(op), front_stack(), back_stack() {}
  bool empty() const { return front_stack.empty() && back_stack.empty(); }
  std::size_t size() const { return front_stack.size() + back_stack.size(); }
  T fold_all() const {
    assert(!empty());
    if (front_stack.empty()) {
      return back_stack.top().sum;
    } else if (back_stack.empty()) {
      return front_stack.top().sum;
    } else {
      return op(front_stack.top().sum, back_stack.top().sum);
    }
  }
  void push(const T &x) {
    if (back_stack.empty()) {
      back_stack.emplace(x, x);
    } else {
      T s{op(back_stack.top().sum, x)};
      back_stack.emplace(x, s);
    }
  }
  void pop() {
    assert(!empty());
    if (front_stack.empty()) {
      front_stack.emplace(back_stack.top().val, back_stack.top().val);
      back_stack.pop();
      while (!back_stack.empty()) {
        T s{op(back_stack.top().val, front_stack.top().sum)};
        front_stack.emplace(back_stack.top().val, s);
        back_stack.pop();
      }
    }
    front_stack.pop();
  }
};
int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    ll N, K, M;
    cin >> N >> K >> M;
    vl A(N);
    REP(i, N) cin >> A[i];
    const ll INF = (1ll<<60);
    vvl dp(N+1, vl(K+1, -INF));
    vvl tmp1(N+1, vl(K+1, -INF));
    vvl tmp2(N+1, vl(K+1, -INF));
    vl S(N+1, 0);
    REP(i, N) S[i+1] = S[i] + A[i]; 
    dp[0][0] = 0;
    auto f = [](ll x, ll y){
        return max(x, y);
    };
    
    for(int j=1;j<=K;j++){
        REP(i, N+1) tmp1[i][j-1] = dp[i][j-1] + S[i];
        REP(i, N+1) tmp2[i][j-1] = dp[i][j-1] - S[i];
        
        queue_aggregation<ll, decltype(f)> qa1(f), qa2(f);
        for(int i=1;i<=N;i++){
            qa1.push(tmp1[i-1][j-1]);
            qa2.push(tmp2[i-1][j-1]);
            ll ma1 = qa1.fold_all();
            ll ma2 = qa2.fold_all();
            chmax(dp[i][j], ma1 - S[i]);
            chmax(dp[i][j], ma2 + S[i]);
            if(i>=M) qa1.pop();
            if(i>=M) qa2.pop();
        }
    }
    cout << dp[N][K] << endl;
    return 0;
}
            
            
            
        
            
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