結果

問題 No.1371 交換門松列・松
ユーザー noimi
提出日時 2021-01-29 22:02:42
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 250 ms / 4,000 ms
コード長 16,156 bytes
コンパイル時間 2,934 ms
コンパイル使用メモリ 235,484 KB
最終ジャッジ日時 2025-01-18 09:13:59
ジャッジサーバーID
（参考情報） 		judge2 / judge4
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 * 3
other AC * 29
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

#pragma region Macros
// #pragma GCC target("avx2")
#pragma GCC optimize("O3")
// #pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define rep2(i, a, b) for(ll i = a; i <= b; ++i)
#define rep(i, n) for(ll i = 0; i < n; ++i)
#define rep3(i, a, b) for(ll i = a; i >= b; --i)
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pb push_back
#define eb emplace_back
#define vi vector<int>
#define vll vector<ll>
#define vpi vector<pii>
#define vpll vector<pll>
#define overload2(_1, _2, name, ...) name
#define vec(type, name, ...) vector<type> name(__VA_ARGS__)
#define VEC(type, name, size)                                                                                                                        
              \
    vector<type> name(size);                                                                                                                         
                  \
    IN(name)
#define vv(type, name, h, ...) vector<vector<type>> name(h, vector<type>(__VA_ARGS__))
#define VV(type, name, h, w)                                                                                                                         
              \
    vector<vector<type>> name(h, vector<type>(w));                                                                                                   
                  \
    IN(name)
#define vvv(type, name, h, w, ...) vector<vector<vector<type>>> name(h, vector<vector<type>>(w, vector<type>(__VA_ARGS__)))
#define vvvv(type, name, a, b, c, ...)                                                                                                               
              \
    vector<vector<vector<vector<type>>>> name(a, vector<vector<vector<type>>>(b, vector<vector<type>>(c, vector<type>(__VA_ARGS__))))
#define mt make_tuple
#define fi first
#define se second
#define all(c) begin(c), end(c)
#define lb(c, x) distance((c).begin(), lower_bound(all(c), (x)))
#define ub(c, x) distance((c).begin(), upper_bound(all(c), (x)))
using namespace std;
constexpr pii dx4[4] = {pii{1, 0}, pii{0, 1}, pii{-1, 0}, pii{0, -1}};
constexpr pii dx8[8] = {{1, 0}, {1, 1}, {0, 1}, {-1, 1}, {-1, 0}, {-1, -1}, {0, -1}, {1, -1}};
const string YESNO[2] = {"NO", "YES"};
const string YesNo[2] = {"No", "Yes"};
const string yesno[2] = {"no", "yes"};
void YES(bool t = 1) { cout << YESNO[t] << endl; }
void Yes(bool t = 1) { cout << YesNo[t] << endl; }
void yes(bool t = 1) { cout << yesno[t] << endl; }
template <class T> using vc = vector<T>;
template <class T> using vvc = vector<vc<T>>;
template <class T> using vvvc = vector<vvc<T>>;
template <class T> using vvvvc = vector<vvvc<T>>;
template <class T> using pq = priority_queue<T>;
template <class T> using pqg = priority_queue<T, vector<T>, greater<T>>;
#define si(c) (int)(c).size()
#define INT(...)                                                                                                                                     
              \
    int __VA_ARGS__;                                                                                                                                 
                  \
    IN(__VA_ARGS__)
#define LL(...)                                                                                                                                      
              \
    ll __VA_ARGS__;                                                                                                                                  
                  \
    IN(__VA_ARGS__)
#define STR(...)                                                                                                                                     
              \
    string __VA_ARGS__;                                                                                                                              
                  \
    IN(__VA_ARGS__)
#define CHR(...)                                                                                                                                     
              \
    char __VA_ARGS__;                                                                                                                                
                  \
    IN(__VA_ARGS__)
#define DBL(...)                                                                                                                                     
              \
    double __VA_ARGS__;                                                                                                                              
                  \
    IN(__VA_ARGS__)
int scan() { return getchar(); }
void scan(int &a) { cin >> a; }
void scan(long long &a) { cin >> a; }
void scan(char &a) { cin >> a; }
void scan(double &a) { cin >> a; }
void scan(string &a) { cin >> a; }
template <class T, class S> void scan(pair<T, S> &p) { scan(p.first), scan(p.second); }
template <class T> void scan(vector<T> &);
template <class T> void scan(vector<T> &a) {
    for(auto &i : a) scan(i);
}
template <class T> void scan(T &a) { cin >> a; }
void IN() {}
template <class Head, class... Tail> void IN(Head &head, Tail &...tail) {
    scan(head);
    IN(tail...);
}
template <class T, class S> inline bool chmax(T &a, const S &b) { return (a < b ? a = b, 1 : 0); }
template <class T, class S> inline bool chmin(T &a, const S &b) { return (a > b ? a = b, 1 : 0); }
vi iota(int n) {
    vi a(n);
    iota(all(a), 0);
    return a;
}
template <typename T> vi iota(vector<T> &a, bool greater = false) {
    vi res(a.size());
    iota(all(res), 0);
    sort(all(res), [&](int i, int j) {
        if(greater) return a[i] > a[j];
        return a[i] < a[j];
    });
    return res;
}
#define UNIQUE(x) sort(all(x)), x.erase(unique(all(x)), x.end())
template <class T> T POW(T x, int n) {
    T res = 1;
    for(; n; n >>= 1, x *= x)
        if(n & 1) res *= x;
    return res;
}
vector<pll> factor(ll x) {
    vector<pll> ans;
    for(ll i = 2; i * i <= x; i++)
        if(x % i == 0) {
            ans.push_back({i, 1});
            while((x /= i) % i == 0) ans.back().second++;
        }
    if(x != 1) ans.push_back({x, 1});
    return ans;
}
template <class T> vector<T> divisor(T x) {
    vector<T> ans;
    for(T i = 1; i * i <= x; i++)
        if(x % i == 0) {
            ans.pb(i);
            if(i * i != x) ans.pb(x / i);
        }
    return ans;
}
template <typename T> void zip(vector<T> &x) {
    vector<T> y = x;
    sort(all(y));
    for(int i = 0; i < x.size(); ++i) { x[i] = lb(y, x[i]); }
}
int topbit(signed t) { return t == 0 ? -1 : 31 - __builtin_clz(t); }
int topbit(ll t) { return t == 0 ? -1 : 63 - __builtin_clzll(t); }
int lowbit(signed a) { return a == 0 ? 32 : __builtin_ctz(a); }
int lowbit(ll a) { return a == 0 ? 64 : __builtin_ctzll(a); }
// int allbit(int n) { return (1 << n) - 1; }
ll allbit(ll n) { return (1LL << n) - 1; }
int popcount(signed t) { return __builtin_popcount(t); }
int popcount(ll t) { return __builtin_popcountll(t); }
bool ispow2(int i) { return i && (i & -i) == i; }
int in() {
    int x;
    cin >> x;
    return x;
}
ll lin() {
    unsigned long long x;
    cin >> x;
    return x;
}
template <class T> pair<T, T> operator-(const pair<T, T> &x, const pair<T, T> &y) { return pair<T, T>(x.fi - y.fi, x.se - y.se); }
template <class T> pair<T, T> operator+(const pair<T, T> &x, const pair<T, T> &y) { return pair<T, T>(x.fi + y.fi, x.se + y.se); }
template <class T> ll operator*(const pair<T, T> &x, const pair<T, T> &y) { return (ll)x.fi * y.fi + (ll)x.se * y.se; }
template <typename T> struct edge {
    int from, to;
    T cost;
    int id;
    edge(int to, T cost) : from(-1), to(to), cost(cost) {}
    edge(int from, int to, T cost) : from(from), to(to), cost(cost) {}
    edge(int from, int to, T cost, int id) : from(from), to(to), cost(cost), id(id) {}
    edge &operator=(const int &x) {
        to = x;
        return *this;
    }
    operator int() const { return to; }
};
template <typename T> using Edges = vector<edge<T>>;
using Tree = vector<vector<int>>;
using Graph = vector<vector<int>>;
template <class T> using Wgraph = vector<vector<edge<T>>>;
Graph getG(int n, int m = -1, bool directed = false, int margin = 1) {
    Tree res(n);
    if(m == -1) m = n - 1;
    while(m--) {
        int a, b;
        cin >> a >> b;
        a -= margin, b -= margin;
        res[a].emplace_back(b);
        if(!directed) res[b].emplace_back(a);
    }
    return move(res);
}
template <class T> Wgraph<T> getWg(int n, int m = -1, bool directed = false, int margin = 1) {
    Wgraph<T> res(n);
    if(m == -1) m = n - 1;
    while(m--) {
        int a, b;
        T c;
        cin >> a >> b >> c;
        a -= margin, b -= margin;
        res[a].emplace_back(b, c);
        if(!directed) res[b].emplace_back(a, c);
    }
    return move(res);
}
#define i128 __int128_t
#define ull unsigned long long int
#define TEST                                                                                                                                         
              \
    INT(testcases);                                                                                                                                  
                  \
    while(testcases--)
template <class T> ostream &operator<<(ostream &os, const vector<T> &v) {
    for(auto it = begin(v); it != end(v); ++it) {
        if(it == begin(v))
            os << *it;
        else
            os << " " << *it;
    }
    return os;
}
template <class T, class S> ostream &operator<<(ostream &os, const pair<T, S> &p) {
    os << p.first << " " << p.second;
    return os;
}
template <class S, class T> string to_string(pair<S, T> p) { return "(" + to_string(p.first) + "," + to_string(p.second) + ")"; }
template <class A> string to_string(A v) {
    if(v.empty()) return "{}";
    string ret = "{";
    for(auto &x : v) ret += to_string(x) + ",";
    ret.back() = '}';
    return ret;
}
string to_string(string s) { return "\"" + s + "\""; }
void dump() { cerr << endl; }
template <class Head, class... Tail> void dump(Head head, Tail... tail) {
    cerr << to_string(head) << " ";
    dump(tail...);
}
#define endl '\n'
#ifdef _LOCAL
#undef endl
#define debug(x)                                                                                                                                     
              \
    cout << #x << ": ";                                                                                                                              
                  \
    dump(x)
#else
#define debug(x)
#endif
template <typename T> static constexpr T inf = numeric_limits<T>::max() / 2;
struct Setup_io {
    Setup_io() {
        ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
        cout << fixed << setprecision(15);
    }
} setup_io;
#define drop(s) cout << #s << endl, exit(0)
#pragma endregion
struct SuccinctIndexableDictionary {
    size_t length;
    size_t blocks;
    vector<unsigned> bit, sum;
    SuccinctIndexableDictionary() {}
    SuccinctIndexableDictionary(size_t _length) {
        length = _length;
        blocks = (length + 31) >> 5;
        bit.assign(blocks, 0U);
        sum.assign(blocks, 0U);
    }
    void set(int k) { bit[k >> 5] |= 1U << (k & 31); }
    void build() {
        sum[0] = 0U;
        for(int i = 1; i < blocks; i++) { sum[i] = sum[i - 1] + __builtin_popcount(bit[i - 1]); }
    }
    bool operator[](int k) const { return (bool((bit[k >> 5] >> (k & 31)) & 1)); }
    int rank(int k) { return (sum[k >> 5] + __builtin_popcount(bit[k >> 5] & ((1U << (k & 31)) - 1))); }
    int rank(bool val, int k) { return (val ? rank(k) : k - rank(k)); }
    int select(bool val, int k) {
        if(k < 0 || rank(val, length) <= k) return (-1);
        int low = 0, high = length;
        while(high - low > 1) {
            int mid = (low + high) >> 1;
            if(rank(val, mid) >= k + 1)
                high = mid;
            else
                low = mid;
        }
        return (high - 1);
    }
    int select(bool val, int i, int l) { return select(val, i + rank(val, l)); }
};
template <class T, int MAXLOG> struct WaveletMatrix {
    size_t length;
    SuccinctIndexableDictionary matrix[MAXLOG];
    int zs[MAXLOG];
    int buff1[MAXLOG], buff2[MAXLOG];
    int freq_dfs(int d, int l, int r, T val, T a, T b) {
        if(l == r) return 0;
        if(d == MAXLOG) return (a <= val && val < b) ? r - l : 0;
        T nv = 1ULL << (MAXLOG - d - 1) | val, nnv = ((1ULL << (MAXLOG - d - 1)) - 1) | nv;
        if(nnv < a || b <= val) return 0;
        if(a <= val && nnv < b) return r - l;
        int lc = matrix[d].rank(1, l), rc = matrix[d].rank(1, r);
        return freq_dfs(d + 1, l - lc, r - rc, val, a, b) + freq_dfs(d + 1, lc + zs[d], rc + zs[d], nv, a, b);
    }
    WaveletMatrix(vector<T> data) {
        length = data.size();
        vector<T> l(length), r(length);
        for(int depth = 0; depth < MAXLOG; depth++) {
            matrix[depth] = SuccinctIndexableDictionary(length + 1);
            int left = 0, right = 0;
            for(int i = 0; i < length; i++) {
                bool k = (data[i] >> (MAXLOG - depth - 1)) & 1;
                if(k)
                    r[right++] = data[i], matrix[depth].set(i);
                else
                    l[left++] = data[i];
            }
            zs[depth] = left;
            matrix[depth].build();
            swap(l, data);
            for(int i = 0; i < right; i++) data[left + i] = r[i];
        }
    }
    T access(int k) {
        int ret = 0;
        bool bit;
        for(int depth = 0; depth < MAXLOG; depth++) {
            bit = matrix[depth][k];
            ret = (ret << 1) | bit;
            k = matrix[depth].rank(bit, k) + zs[depth] * bit;
        }
        return (ret);
    }
    int rank(T val, int k) {
        int l = 0, r = k;
        for(int depth = 0; depth < MAXLOG; depth++) {
            buff1[depth] = l, buff2[depth] = r;
            bool bit = (val >> (MAXLOG - depth - 1)) & 1;
            l = matrix[depth].rank(bit, l) + zs[depth] * bit;
            r = matrix[depth].rank(bit, r) + zs[depth] * bit;
        }
        return (r - l);
    }
    int select(T val, int kth) {
        rank(val, length);
        for(int depth = MAXLOG - 1; depth >= 0; depth--) {
            bool bit = (val >> (MAXLOG - depth - 1)) & 1;
            kth = matrix[depth].select(bit, kth, buff1[depth]);
            if(kth >= buff2[depth] || kth < 0) return (-1);
            kth -= buff1[depth];
        }
        return (kth);
    }
    int select(T val, int k, int l) { return select(val, k + rank(val, l)); }
    int quantile(int left, int right, int kth) {
        if(right - left <= kth || kth < 0) return (-1);
        T ret = 0;
        for(int depth = 0; depth < MAXLOG; depth++) {
            int l = matrix[depth].rank(1, left);
            int r = matrix[depth].rank(1, right);
            if(r - l > kth) {
                left = l + zs[depth];
                right = r + zs[depth];
                ret |= 1ULL << (MAXLOG - depth - 1);
            } else {
                kth -= r - l;
                left -= l;
                right -= r;
            }
        }
        return ret;
    }
    int rangefreq(int left, int right, T lower, T upper) { return freq_dfs(0, left, right, 0, lower, upper); }
};
int main() {
    INT(n);
    VEC(int, a, n);
    // WaveletMatrix<int, 18> mat(a);
    rep(i, n) a[i]--;
    a.eb(a[n - 2]);
    ll ans = 0;
    vi t(n), s(n);
    rep(i, n) {
        if(a[i] < a[i + 1]) {
            int mi = a[i + 1];
            if(i) chmin(mi, a[i - 1]);
            t[a[i]] = mi;
            s[a[i]] = n;
        } else {
            int ma = a[i + 1];
            if(i) chmax(ma, a[i - 1]);
            s[a[i]] = ma;
            t[a[i]] = -1;
        }
    }
    WaveletMatrix<int, 18> T(t), S(s);
    // dump(t, s);
    rep(i, n) {
        if(t[a[i]] >= 0) {
            int k = t[a[i]];
            ans += T.rangefreq(0, k, a[i] + 1, n);
            ans += S.rangefreq(0, k, 0, a[i]);
        } else {
            int k = s[a[i]];
            ans += T.rangefreq(k + 1, n, a[i] + 1, n);
            ans += S.rangefreq(k + 1, n, 0, a[i]);
        }
    }
    cout << (ans - n) / 2 << endl;
}
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