結果

問題 No.999 てん vs. ほむ
ユーザー ningenMeningenMe
提出日時 2020-02-29 01:30:49
言語 C++14
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 86 ms / 2,000 ms
コード長 2,723 bytes
コンパイル時間 1,834 ms
コンパイル使用メモリ 167,432 KB
実行使用メモリ 6,652 KB
最終ジャッジ日時 2024-04-21 21:17:20
合計ジャッジ時間 3,457 ms
ジャッジサーバーID
(参考情報)
judge5 / judge1
このコードへのチャレンジ
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 2 ms
5,248 KB
testcase_01 AC 2 ms
5,376 KB
testcase_02 AC 2 ms
5,376 KB
testcase_03 AC 2 ms
5,376 KB
testcase_04 AC 2 ms
5,376 KB
testcase_05 AC 2 ms
5,376 KB
testcase_06 AC 2 ms
5,376 KB
testcase_07 AC 2 ms
5,376 KB
testcase_08 AC 4 ms
5,376 KB
testcase_09 AC 79 ms
6,500 KB
testcase_10 AC 25 ms
5,376 KB
testcase_11 AC 17 ms
5,376 KB
testcase_12 AC 36 ms
5,376 KB
testcase_13 AC 84 ms
6,640 KB
testcase_14 AC 84 ms
6,512 KB
testcase_15 AC 84 ms
6,384 KB
testcase_16 AC 86 ms
6,512 KB
testcase_17 AC 56 ms
6,652 KB
testcase_18 AC 56 ms
6,500 KB
testcase_19 AC 56 ms
6,392 KB
testcase_20 AC 58 ms
6,532 KB
testcase_21 AC 84 ms
6,484 KB
testcase_22 AC 84 ms
6,444 KB
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 #

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ull = unsigned long long;
 
#define ALL(obj) (obj).begin(),(obj).end()
#define SPEED cin.tie(0);ios::sync_with_stdio(false);
 
template<class T> using PQ = priority_queue<T>;
template<class T> using PQR = priority_queue<T,vector<T>,greater<T>>;
 
constexpr long long MOD = (long long)1e9 + 7;
constexpr long long MOD2 = 998244353;
constexpr long long HIGHINF = (long long)1e18;
constexpr long long LOWINF = (long long)1e15;
constexpr long double PI = 3.1415926535897932384626433;
 
template <class T> vector<T> multivector(size_t N,T init){return vector<T>(N,init);}
template <class... T> auto multivector(size_t N,T... t){return vector<decltype(multivector(t...))>(N,multivector(t...));}
template <class T> void corner(bool flg, T hoge) {if (flg) {cout << hoge << endl; exit(0);}}
template <class T, class U>ostream &operator<<(ostream &o, const map<T, U>&obj) {o << "{"; for (auto &x : obj) o << " {" << x.first << " : " << x.second << "}" << ","; o << " }"; return o;}
template <class T>ostream &operator<<(ostream &o, const set<T>&obj) {o << "{"; for (auto itr = obj.begin(); itr != obj.end(); ++itr) o << (itr != obj.begin() ? ", " : "") << *itr; o << "}"; return o;}
template <class T>ostream &operator<<(ostream &o, const multiset<T>&obj) {o << "{"; for (auto itr = obj.begin(); itr != obj.end(); ++itr) o << (itr != obj.begin() ? ", " : "") << *itr; o << "}"; return o;}
template <class T>ostream &operator<<(ostream &o, const vector<T>&obj) {o << "{"; for (int i = 0; i < (int)obj.size(); ++i)o << (i > 0 ? ", " : "") << obj[i]; o << "}"; return o;}
template <class T, class U>ostream &operator<<(ostream &o, const pair<T, U>&obj) {o << "{" << obj.first << ", " << obj.second << "}"; return o;}
void print(void) {cout << endl;}
template <class Head> void print(Head&& head) {cout << head;print();}
template <class Head, class... Tail> void print(Head&& head, Tail&&... tail) {cout << head << " ";print(forward<Tail>(tail)...);}
template <class T> void chmax(T& a, const T b){a=max(a,b);}
template <class T> void chmin(T& a, const T b){a=min(a,b);}
void YN(bool flg) {cout << (flg ? "YES" : "NO") << endl;}
void Yn(bool flg) {cout << (flg ? "Yes" : "No") << endl;}
void yn(bool flg) {cout << (flg ? "yes" : "no") << endl;}

int main() {
	int N; cin >> N;
	vector<ll> A(2*N),B,C;
	for(int i = 0; i < 2*N; ++i) cin >> A[i];
	for(int i = 0; i < 2*N; ++i) (i%2?C:B).push_back(A[i]);
	for(int i = 1; i < N; ++i) B[i] += B[i-1];
	for(int i = N-2; 0 <= i; --i) C[i] += C[i+1];
	ll sum = accumulate(ALL(A),0LL);
	ll ans = 2*max(B[N-1],C[0]) - sum;
	for(int i = 0; i + 1 < N; ++i) chmax(ans,2*(B[i]+C[i+1])-sum);
	cout << ans << endl;
    return 0;
}
0