結果

問題 No.2854 -1 Subsequence
ユーザー hibit_at
提出日時 2024-08-25 14:37:51
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 147 ms / 2,000 ms
コード長 4,584 bytes
コンパイル時間 948 ms
コンパイル使用メモリ 113,232 KB
最終ジャッジ日時 2025-02-24 01:12:35
ジャッジサーバーID
(参考情報)
judge4 / judge3
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
other AC * 40
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 <algorithm>
#include <iostream>
#include <iomanip>
#include <limits.h>
#include <map>
#include <math.h>
#include <numeric>
#include <queue>
#include <set>
#include <sstream>
#include <string>
#include <utility>
#include <vector>
#include <stack>
#include <complex>
using namespace std;
#define rep(i, n) for (int i = 0; i < n; i++)
#define rep1(i, n) for (int i = 1; i < n + 1; i++)
#define rev(i, n) for (int i = n - 1; i >= 0; i--)
#define all(A) A.begin(), A.end()
#define itr(A, l, r) A.begin() + l, A.begin() + r
#define debug(var) cout << #var << " = " << var << endl;
typedef long long ll;
template <typename T1, typename T2>
ostream &operator<<(ostream &os, const pair<T1, T2> &p)
{
os << "(" << p.first << "," << p.second << ")";
return os;
}
template <typename T1, typename T2>
istream &operator>>(istream &is, pair<T1, T2> &p)
{
is >> p.first >> p.second;
return is;
}
template <typename T>
ostream &operator<<(ostream &os, const vector<T> &v)
{
for (int i = 0; i < (int)v.size(); i++)
{
os << v[i] << (i + 1 != (int)v.size() ? " " : "");
}
return os;
}
template <typename T>
ostream &operator<<(ostream &os, const vector<vector<T>> &v)
{
for (int i = 0; i < (int)v.size(); i++)
{
os << v[i] << endl;
}
return os;
}
template <typename T>
ostream &operator<<(ostream &os, const vector<vector<vector<T>>> &v)
{
int n = v.size();
int m = v[0].size();
int p = v[0][0].size();
rep(k, p)
{
os << "k = " << k << endl;
rep(i, n)
{
rep(j, m)
{
os << v[i][j][k];
if (j < m - 1)
{
os << " ";
}
else
{
os << endl;
}
}
}
}
return os;
}
template <typename T>
istream &operator>>(istream &is, vector<T> &v)
{
for (T &in : v)
is >> in;
return is;
}
template <typename T, typename S>
ostream &operator<<(ostream &os, map<T, S> &mp)
{
for (auto &[key, val] : mp)
{
os << key << ":" << val << " ";
}
cout << endl;
return os;
}
template <typename T>
ostream &operator<<(ostream &os, set<T> st)
{
auto itr = st.begin();
for (int i = 0; i < (int)st.size(); i++)
{
os << *itr << (i + 1 != (int)st.size() ? " " : "");
itr++;
}
return os;
}
template <typename T>
ostream &operator<<(ostream &os, multiset<T> st)
{
auto itr = st.begin();
for (int i = 0; i < (int)st.size(); i++)
{
os << *itr << (i + 1 != (int)st.size() ? " " : "");
itr++;
}
return os;
}
template <typename T>
ostream &operator<<(ostream &os, queue<T> q)
{
while (q.size())
{
os << q.front() << " ";
q.pop();
}
return os;
}
template <typename T>
ostream &operator<<(ostream &os, deque<T> q)
{
while (q.size())
{
os << q.front() << " ";
q.pop_front();
}
return os;
}
template <typename T>
ostream &operator<<(ostream &os, stack<T> st)
{
while (st.size())
{
os << st.top() << " ";
st.pop();
}
return os;
}
template <typename T>
ostream &operator<<(ostream &os, priority_queue<T> pq)
{
while (pq.size())
{
os << pq.top() << " ";
pq.pop();
}
return os;
}
template <typename T>
ostream &operator<<(ostream &os, priority_queue<T, vector<T>, greater<T>> mpq)
{
while (mpq.size())
{
os << mpq.top() << " ";
mpq.pop();
}
return os;
}
int main(){
ll n;
cin >> n;
vector<ll> a(n);
cin >> a;
// vector<vector<vector<ll>>> dp(n+1,vector<ll>(2,-1));
using VI = vector<ll>;
using VVI = vector<VI>;
using VVVI = vector<VVI>;
using VVVVI = vector<VVVI>;
using VVVVVI = vector<VVVVI>;
VVVI dp(n+1,VVI(2,VI(2,-1e18)));
dp[0][0][0] = 0;
auto chmax = [](auto &a, auto b)
{ a = max(a, b); };
dp[0][0][0] = 0;
rep(i,n){
rep(state,2){
rep(virgin,2){
if(dp[i][state][virgin] == -1e18){
continue;
}
chmax(dp[i+1][state][virgin],dp[i][state][virgin]);
ll next_val = dp[i][state][virgin];
if(state == 0){
next_val -= a[i];
}else{
next_val += a[i];
}
chmax(dp[i+1][state^1][virgin|1],next_val);
}
}
}
cout << max(dp[n][0][1],dp[n][1][1]) << endl;
}
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
0