結果

問題 No.2036 Max Middle
ユーザー asaringo
提出日時 2023-11-11 16:06:32
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 37 ms / 2,000 ms
コード長 3,688 bytes
コンパイル時間 2,229 ms
コンパイル使用メモリ 206,012 KB
最終ジャッジ日時 2025-02-17 21:35:17
ジャッジサーバーID
（参考情報） 		judge5 / judge5
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 * 4
other AC * 17
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>
using namespace std;
#define overload1(a, ...) a
#define overload2(a, b, ...) b
#define overload3(a, b, c, ...) c
#define overload4(a, b, c, d, ...) d
#define overload5(a, b, c, d, e ...) e
#define overload6(a, b, c, d, e, f ...) f
#define overload7(a, b, c, d, e, f, g ...) g
#define fast_io ios::sync_with_stdio(false); cin.tie(nullptr);
#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math")
typedef __int128_t int128;
typedef long long ll;
typedef long double ld;
#define chmin(a,b) a = min(a,b);
#define chmax(a,b) a = max(a,b);
#define bit_count(x) __builtin_popcountll(x)
#define leading_zero_count(x) __builtin_clz(x)
#define trailing_zero_count(x) __builtin_ctz(x)
#define gcd(a,b) __gcd(a,b)
#define lcm(a,b) a / gcd(a,b) * b
#define rep(...) overload4(__VA_ARGS__, rrep, rep1, rep0)(__VA_ARGS__)
#define rep0(n) for(int _ = 0 ; _ < n ; _++)
#define rep1(i,n) for(int i = 0 ; i < n ; i++)
#define rrep(i,a,b) for(int i = a ; i < b ; i++)
#define repi(it,S) for(auto it = S.begin() ; it != S.end() ; it++)
#define pt(a) cout << a << endl;
#define print(...) printall(__VA_ARGS__);
#define debug(a) cout << #a << " " << a << endl;
#define all(a) a.begin(), a.end()
#define endl "\n";
#define v1(T,n,a) vector<T>(n,a)
#define v2(T,n,m,a) vector<vector<T>>(n,v1(T,m,a))
#define v3(T,n,m,k,a) vector<vector<vector<T>>>(n,v2(T,m,k,a))
#define v4(T,n,m,k,l,a) vector<vector<vector<vector<T>>>>(n,v3(T,m,k,l,a))
template<typename T,typename U>istream &operator>>(istream&is,pair<T,U>&p){is>>p.first>>p.second;return is;}
template<typename T,typename U>ostream &operator<<(ostream&os,const pair<T,U>&p){os<<p.first<<" "<<p.second;return os;}
template<typename T>istream &operator>>(istream&is,vector<T>&v){for(T &in:v){is>>in;}return is;}
template<typename T>ostream &operator<<(ostream&os,const vector<T>&v){for(auto it=v.begin();it!=v.end();){os<<*it<<((++it)!=v.end()?" ":"");}return os
    ;}
template<typename T>istream &operator>>(istream&is,vector<vector<T>>&v){for(T &in:v){is>>in;}return is;}
template<typename T>ostream &operator<<(ostream&os,const vector<vector<T>>&v){for(auto it=v.begin();it!=v.end();){os<<*it<<((++it)!=v.end()?"\n":""
    );}return os;}
template<typename T>ostream &operator<<(ostream&os,const set<T>&v){for(auto it=v.begin();it!=v.end();){os<<*it<<((++it)!=v.end()?" ":"");}return os;}
template<typename T>ostream &operator<<(ostream&os,const multiset<T>&v){for(auto it=v.begin();it!=v.end();){os<<*it<<((++it)!=v.end()?" ":"");}return 
    os;}
template<class... Args> void printall(Args... args){for(auto i:initializer_list<common_type_t<Args...>>{args...}) cout<<i<<" ";cout<<endl;}
void solve(){
    ll n;
    cin >> n;
    vector<int> A(n);
    cin >> A;
    rep(2){
        while(A.size() > 1){
            int a = A.back(); A.pop_back();
            int b = A.back();
            if(a < b){
                A.push_back(a);
                break;
            }
        }
        reverse(all(A));
    }
    n = A.size();
    A.push_back(-2e9);
    vector<vector<int>> B;
    vector<int> V;
    rep(i,n+1){
        if(i == n || A[i] > A[i+1]){
            if(!V.empty()){
                V.push_back(i);
                B.push_back(V);
            }
            V = {};
            continue;
        }
        V.push_back(i);
    }
    B.push_back({(int)n-1});
    ll res = 0;
    ll add = 0;
    rep(i,B.size()-1){
        ll as = B[i].size() + add - 1;
        ll bs = B[i+1].front() - B[i].back();
        ll mn = min(as,bs);
        res += mn * (mn - 1);
        res += (as + bs + 1 - mn * 2) * mn;
        add = as;
    }
    pt(res)
}
int main(){
    fast_io
    int t = 1;
    // cin >> t;
    rep(i,t) solve();
}
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