結果
| 問題 |
No.1188 レベルX門松列
|
| コンテスト | |
| ユーザー |
 Konton7
|
| 提出日時 | 2020-08-23 21:59:24 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 314 ms / 2,000 ms |
| コード長 | 8,470 bytes |
| コンパイル時間 | 3,401 ms |
| コンパイル使用メモリ | 225,424 KB |
| 最終ジャッジ日時 | 2025-01-13 12:56:48 |
|
ジャッジサーバーID （参考情報） |
judge5 / judge2 |
（要ログイン）
| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 21 |
ソースコード
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using VI = vector<int>;
using VL = vector<ll>;
using VS = vector<string>;
using VB = vector<bool>;
using VVB = vector<vector<bool>>;
using VVI = vector<VI>;
using VVL = vector<VL>;
using PII = std::pair<int, int>;
using VPII = std::vector<std::pair<int, int>>;
using PLL = std::pair<ll, ll>;
using VPLL = std::vector<std::pair<ll, ll>>;
using TI3 = std::tuple<int, int, int>;
using TI4 = std::tuple<int, int, int, int>;
using TL3 = std::tuple<ll, ll, ll>;
using TL4 = std::tuple<ll, ll, ll, ll>;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define repr(i, n) for (int i = (int)(n)-1; i >= 0; i--)
#define rep2(i, s, n) for (int i = (s); i < (int)(n); i++)
#define rep3(i, s, n, d) for (int i = (s); i < (int)(n); i += (d))
#define allpt(v) (v).begin(), (v).end()
#define allpt_c(v) (v).cbegin(), (v).cend()
#define allpt_r(v) (v).rbegin(), (v).rend()
#define allpt_cr(v) (v).crbegin(), (v).crend()
const int mod1 = 1e9 + 7, mod2 = 998244353, mod3 = 1e9 + 9;
const int mod = mod1;
const ll inf = 1e18;
const string wsp = " ";
const string tb = "\t";
const string rt = "\n";
const string alphabets = "abcdefghijklmnopqrstuvwxyz";
template <typename T>
void show1dvec(const vector<T> &v) {
if (v.size() == 0) return;
int n = v.size() - 1;
rep(i, n) cout << v[i] << wsp;
cout << v[n] << rt;
return;
}
template <typename T>
void show2dvec(const vector<vector<T>> &v) {
int n = v.size();
rep(i, n) show1dvec(v[i]);
}
template <typename T, typename S>
void show1dpair(const vector<pair<T, S>> &v) {
int n = v.size();
rep(i, n) cout << v[i].first << wsp << v[i].second << rt;
return;
}
template <typename T, typename S>
void pairzip(const vector<pair<T, S>> &v, vector<T> &t, vector<T> &s) {
int n = v.size();
rep(i, n) {
t.push_back(v[i].first);
s.push_back(v[i].second);
}
return;
}
template <typename T>
void maxvec(vector<T> &v) {
T s = v[0];
int n = v.size();
rep(i, n - 1) {
if (s > v[i + 1]) {
v[i + 1] = s;
}
s = v[i + 1];
}
}
template <typename T, typename S>
bool myfind(T t, S s) {
return find(t.cbegin(), t.cend(), s) != t.cend();
}
bool check(int y, int x, int h, int w) {
return 0 <= y && y < h && 0 <= x && x < w;
}
bool iskadomatsu(int a, int b, int c) {
return (a != b && b != c && c != a) &&
((a > b && b < c) || (a < b && b > c));
}
double euc_dist(PII a, PII b) {
return sqrt(pow(a.first - b.first, 2) + pow(a.second - b.second, 2));
}
VS split(string s, char c) {
VS ret;
string part;
s += c;
rep(i, s.length()) {
if (s[i] == c) {
ret.emplace_back(part);
part = "";
} else if (s[i] != c) {
part += s[i];
}
}
return ret;
}
template <typename T, typename S, typename R>
ll pow_mod(T p, S q, R mod = 1ll) {
ll ret = 1, r = p;
while (q) {
if (q % 2) ret *= r, ret %= mod;
r = (r * r) % mod, q /= 2;
}
return ret % mod;
}
template <typename T, typename S>
ll pow_no_mod(T p, S q) {
ll ret = 1, r = p;
while (q) {
if (q % 2) ret *= r;
r = (r * r), q /= 2;
}
return ret;
}
void make_frac_tables(VL &frac_list, VL &frac_inv_list) {
rep(i, frac_list.size() - 1) {
frac_list[i + 1] *= frac_list[i] * (i + 1);
frac_list[i + 1] %= mod;
frac_inv_list[i + 1] *= frac_inv_list[i] * pow_mod(i + 1, mod - 2, mod);
frac_inv_list[i + 1] %= mod;
}
}
pair<VL, VL> make_frac_tables(int n) {
VL frac_list(n + 1, 1), frac_inv_list(n + 1, 1);
rep(i, n) {
frac_list[i + 1] *= frac_list[i] * (i + 1);
frac_list[i + 1] %= mod;
frac_inv_list[i + 1] *= frac_inv_list[i] * pow_mod(i + 1, mod - 2, mod);
frac_inv_list[i + 1] %= mod;
}
return make_pair(frac_list, frac_inv_list);
}
ll comb(int a, int b, const VL &frac_list, const VL &frac_inv_list) {
if (a < b) return 0;
if (b < 0) return 0;
ll ret = frac_list[a];
ret *= frac_inv_list[b];
ret %= mod;
ret *= frac_inv_list[a - b];
ret %= mod;
return ret;
}
void djkstra(int n, int s, int t, const vector<set<int>> &connect) {
const int intm = 1e9;
vector<int> shortest(n, intm);
shortest[s] = 0;
vector<int> search = {s};
vector<int> new_search;
while (!search.empty()) {
for (auto i : search) {
for (auto j : connect[i]) {
if (shortest[j] > 1 + shortest[i]) {
shortest[j] = 1 + shortest[i];
new_search.emplace_back(j);
}
}
}
search.clear();
search = new_search;
new_search.clear();
// show1dvec(search);
// show1dvec(shortest);
}
if (shortest[t] == intm) shortest[t] = -1;
printf("%d\n", shortest[t]);
}
template <typename T>
void coordinate_compress(vector<T> &x, map<T, int> &zip, int &xs) {
sort(x.begin(), x.end());
x.erase(unique(x.begin(), x.end()), x.end());
xs = x.size();
for (int i = 0; i < xs; i++) {
zip[x[i]] = i;
}
}
class RangeMinorMaxorSumQuery // 0-index
{
int const intmax = 2147483647;
int const intmin = 0;
vector<int> sgt;
int n;
int k;
public:
RangeMinorMaxorSumQuery(int n1, int f = -1) {
if (f == -1)
f = intmax;
else if (f == 0)
f = intmin;
int na = 1;
int ka = 0;
while (na < n1) {
na *= 2;
ka++;
}
for (int i = 0; i < 2 * na; i++) sgt.push_back(f);
n = na;
k = ka;
}
void update_max(int i, int x) {
i += n;
sgt[i] = x;
while (i > 1) {
i /= 2;
sgt[i] = max(sgt[2 * i], sgt[2 * i + 1]);
}
}
int getmax(int a, int b, int k = 1, int l = 0,
int r = -1) //閉区間 l <= x < r とする
{
if (r == -1) r = n;
if (r <= a || b <= l) return intmin;
if (a == l && b == r)
return sgt[k];
else
return max(
getmax(a, min(b, (l + r) / 2), 2 * k, l, (l + r) / 2),
getmax(max(a, (l + r) / 2), b, 2 * k + 1, (l + r) / 2, r));
}
void printsegtree() {
for (int i = 0; i < 2 * n; i++) {
cout << sgt[i] << " ";
}
cout << endl;
}
};
int main() {
// cin.tie(0);
// ios::sync_with_stdio(false);
#ifdef DEBUG
cout << "DEBUG MODE" << endl;
ifstream in("input.txt"); // for debug
cin.rdbuf(in.rdbuf()); // for debug
#endif
int n, xs, p, q;
map<int, int> xzip, xzip_inv;
cin >> n;
VI a_list(n), b_list(n), a_inv_list(n), b_inv_list(n);
rep(i, n) {
cin >> a_list[i];
b_list[i] = a_list[i];
a_inv_list[i] = -a_list[i];
b_inv_list[i] = -a_list[i];
}
coordinate_compress(b_list, xzip, xs);
coordinate_compress(b_inv_list, xzip_inv, xs);
rep(i, n) { a_list[i] = xzip[a_list[i]]; }
rep(i, n) { a_inv_list[i] = xzip_inv[a_inv_list[i]]; }
// show1dvec(a_list);
// show1dvec(a_inv_list);
// cout << xs << rt;
RangeMinorMaxorSumQuery sgt_order(xs, 0);
RangeMinorMaxorSumQuery sgt_rev(xs, 0);
RangeMinorMaxorSumQuery inv_sgt_order(xs, 0);
RangeMinorMaxorSumQuery inv_sgt_rev(xs, 0);
VI order_list(n), rev_list(n), inv_order_list(n), inv_rev_list(n);
rep(i, n) {
p = sgt_order.getmax(0, a_list[i]) + 1;
sgt_order.update_max(a_list[i], p);
order_list[i] = p;
q = inv_sgt_order.getmax(0, a_inv_list[i]) + 1;
inv_sgt_order.update_max(a_inv_list[i], q);
inv_order_list[i] = q;
}
repr(i, n) {
p = sgt_rev.getmax(0, a_list[i]) + 1;
sgt_rev.update_max(a_list[i], p);
rev_list[i] = p;
q = inv_sgt_rev.getmax(0, a_inv_list[i]) + 1;
inv_sgt_rev.update_max(a_inv_list[i], q);
inv_rev_list[i] = q;
}
// sgt_order.printsegtree();
// sgt_rev.printsegtree();
// show1dvec(order_list);
// show1dvec(rev_list);
// show1dvec(inv_order_list);
// show1dvec(inv_rev_list);
int ans = 0;
rep(i, n) {
ans = max(ans, min(order_list[i], rev_list[i]) - 1);
ans = max(ans, min(inv_order_list[i], inv_rev_list[i]) - 1);
}
cout << ans << rt;
return 0;
}