結果
問題 | No.1095 Smallest Kadomatsu Subsequence |
ユーザー |
|
提出日時 | 2020-06-26 21:57:34 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 388 ms / 2,000 ms |
コード長 | 3,471 bytes |
コンパイル時間 | 2,094 ms |
コンパイル使用メモリ | 207,788 KB |
最終ジャッジ日時 | 2025-01-11 11:23:58 |
ジャッジサーバーID (参考情報) |
judge1 / judge2 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 30 |
ソースコード
#include <bits/stdc++.h>using namespace std;template <class T> inline bool chmax(T &a, T b) {if(a < b) {a = b;return 1;}return 0;}template <class T> inline bool chmin(T &a, T b) {if(a > b) {a = b;return 1;}return 0;}void debug() { cerr << "\n"; }template <class T> void debug(const T &x) { cerr << x << "\n"; }template <class T, class... Args> void debug(const T &x, const Args &... args) {cerr << x << " ";debug(args...);}template <class T> void debugVector(const vector<T> &v) {for(const T &x : v) {cerr << x << " ";}cerr << "\n";}using ll = long long;#define ALL(v) (v).begin(), (v).end()#define RALL(v) (v).rbegin(), (v).rend()const double EPS = 1e-7;const int INF = 1 << 30;const ll LLINF = 1LL << 60;const double PI = acos(-1);constexpr int MOD = 1000000007;const int dx[4] = {1, 0, -1, 0};const int dy[4] = {0, 1, 0, -1};//-------------------------------------template <typename Monoid> struct SegmentTree {using F = function<Monoid(Monoid, Monoid)>;private:int n;vector<Monoid> node;Monoid E;F f;public:SegmentTree(vector<Monoid> v, Monoid e, const F func) : f(func), E(e) {int sz = v.size();n = 1;while(n < sz) {n *= 2;}node.resize(2 * n - 1, E);for(int i = 0; i < sz; i++) {node[i + n - 1] = v[i];}for(int i = n - 2; i >= 0; i--) {node[i] = f(node[2 * i + 1], node[2 * i + 2]);}}void update(int i, Monoid val) {i += (n - 1);node[i] = val;while(i > 0) {i = (i - 1) / 2;node[i] = f(node[2 * i + 1], node[2 * i + 2]);}}Monoid query(int a, int b, int i = 0, int l = 0, int r = -1) {if(r < 0) {r = n;}if(r <= a || b <= l) {return E;}if(a <= l && r <= b) {return node[i];}Monoid vl = query(a, b, 2 * i + 1, l, (l + r) / 2);Monoid vr = query(a, b, 2 * i + 2, (l + r) / 2, r);return f(vl, vr);}Monoid operator[](const int &i) const { return node[i + n - 1]; }};int main() {cin.tie(0);ios::sync_with_stdio(false);int n;cin >> n;vector<ll> a(n);for(auto &it : a) {cin >> it;}SegmentTree<ll> segmin(a, LLINF, [](ll x, ll y) { return min(x, y); });ll ans = LLINF;// min max minを探すfor(int i = 0; i < n; i++) {ll l = segmin.query(0, i);ll r = segmin.query(i + 1, n);if(l < a[i] && r < a[i]) {chmin(ans, l + a[i] + r);}}// 大小大vector<ll> memo = a;// 今見てる要素より左にあって、今見てる要素よりも大きいa[i]の集合set<ll> se;for(int i = 0; i < n; i++) {auto it = se.lower_bound(a[i]);if(it != se.end()) {memo[i] += *it;} else {memo[i] += LLINF;}se.insert(a[i]);}se.clear();for(int i = n - 1; i >= 0; i--) {auto it = se.lower_bound(a[i]);if(it != se.end()) {memo[i] += *it;} else {memo[i] += LLINF;}se.insert(a[i]);}// debugVector(memo);chmin(ans, *min_element(ALL(memo)));cout << (ans >= LLINF ? -1 : ans) << endl;}