結果

問題 No.1117 数列分割
ユーザー penta
提出日時 2020-07-25 17:51:20
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 802 ms / 3,000 ms
コード長 3,324 bytes
コンパイル時間 2,225 ms
コンパイル使用メモリ 207,476 KB
最終ジャッジ日時 2025-01-12 05:36:02
ジャッジサーバーID
(参考情報)
judge4 / judge1
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 26
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

#include <bits/stdc++.h>
#pragma GCC optimize("O3")
using namespace std;
using ll = long long;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define rep2(i,m,n) for (int i = (m); i < (n); ++i)
#define rep3(i,a,b) for (int i = (a); i >= (b); --i)
#define all(x) (x).begin(),(x).end()
inline int popcount(const int x) { return __builtin_popcount(x);}
inline ll popcount(const ll x) { return __builtin_popcountll(x);}
template<class T> void chmin(T &a, const T &b) noexcept { if (b < a) a = b;}
template<class T> void chmax(T &a, const T &b) noexcept { if (a < b) a = b;}
template<class T> void drop(const T &x) { std::cout<<x<<endl; exit(0);}
void debug_out() { std::cout << "\n";}
template<class T, class... Args> void debug_out(const T &x, const Args &... args) { std::cout<<x<< " "; debug_out(args...);}
#ifdef _DEBUG
#define debug(...) debug_out(__VA_ARGS__)
#else
#define debug(...)
#endif
struct InitIO{
InitIO() {
std::cin.tie(nullptr);
std::ios_base::sync_with_stdio(false);
std::cout << std::fixed << std::setprecision(15);
}
}init_io;
template<class T, class F> struct queue_aggression {
private:
// using F = function<T(T,T)>;
struct node {
T val, sum;
node(const T &val, const T &sum):val(val),sum(sum){}
};
const F f;
stack<node> front_stack, back_stack;
public:
queue_aggression(const F &f):f(f){}
bool empty() const { return front_stack.empty() && back_stack.empty();}
int size() const { return front_stack.size() + back_stack.size();}
T fold_all() {
assert(!empty());
if (front_stack.empty()) return back_stack.top().sum;
else if (back_stack.empty()) return front_stack.top().sum;
else return f(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 = f(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 = f(back_stack.top().val, front_stack.top().sum);
front_stack.emplace(back_stack.top().val, s);
back_stack.pop();
}
}
front_stack.pop();
}
};
const ll INF = 1LL<<60;
int main() {
int n, k, m;
cin >> n >> k >> m;
vector<ll> a(n), s(n+1, 0);
rep(i,n) {
cin >> a[i];
s[i+1] += s[i] + a[i];
}
vector<vector<ll> > dp(n+1, vector<ll>(k+1, -INF));
dp[0][0] = 0;
auto f = [](ll x, ll y){ return max(x,y);};
for (int j = 1; j <= k; ++j) {
queue_aggression<ll, decltype(f)> que1(f), que2(f);
rep(i, n) {
if (i/m+1 > j) continue;
// for (int l = max(0, i+1-m); l <= i; ++l) { //
// // chmax(dp[i+1][j], dp[l][j-1] + (s[i+1] - s[l]));
// // chmax(dp[i+1][j], dp[l][j-1] - (s[i+1] - s[l]));
// chmax(dp[i+1][j], dp[l][j-1] - s[l] + s[i+1]);
// chmax(dp[i+1][j], dp[l][j-1] + s[l] - s[i+1]);
// }
que1.push(dp[i][j-1] - s[i]);
que2.push(dp[i][j-1] + s[i]);
chmax(dp[i+1][j], que1.fold_all() + s[i+1]);
chmax(dp[i+1][j], que2.fold_all() - s[i+1]);
if (que1.size() == m) {
que1.pop(); que2.pop();
}
}
}
cout << dp[n][k] << endl;
return 0;
}
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