結果

問題 No.1079 まお
ユーザー haruki_K
提出日時 2020-06-15 15:47:36
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 1,240 ms / 2,000 ms
コード長 5,668 bytes
コンパイル時間 1,893 ms
コンパイル使用メモリ 181,852 KB
実行使用メモリ 16,512 KB
最終ジャッジ日時 2024-07-03 11:27:21
合計ジャッジ時間 19,262 ms
ジャッジサーバーID
（参考情報） 		judge1 / judge2
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 * 2
other AC * 30
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

// >>> TEMPLATES
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
using i32 = int32_t;
using i64 = int64_t;
using u32 = uint32_t;
using u64 = uint64_t;
#define int ll
#define double ld
#define rep(i,n) for (int i = 0; i < (int)(n); i++)
#define rep1(i,n) for (int i = 1; i <= (int)(n); i++)
#define repR(i,n) for (int i = (int)(n)-1; i >= 0; i--)
#define rep1R(i,n) for (int i = (int)(n); i >= 1; i--)
#define loop(i,a,B) for (int i = a; i B; i++)
#define loopR(i,a,B) for (int i = a; i B; i--)
#define all(x) (x).begin(), (x).end()
#define allR(x) (x).rbegin(), (x).rend()
#define pb push_back
#define eb emplace_back
#define mp make_pair
#define fst first
#define snd second
template <class Int> auto constexpr inf = numeric_limits<Int>::max()/2-1;
auto constexpr INF32 = inf<int32_t>;
auto constexpr INF64 = inf<int64_t>;
auto constexpr INF   = inf<int>;
#ifdef LOCAL
#include "debug.hpp"
#define dump(...) cerr << "[" << setw(3) << __LINE__ << ":" << __FUNCTION__ << "] ", dump_impl(#__VA_ARGS__, __VA_ARGS__)
#define say(x) cerr << "[" << __LINE__ << ":" << __FUNCTION__ << "] " << x << endl
#define debug if (1)
#else
#define dump(...) (void)(0)
#define say(x) (void)(0)
#define debug if (0)
#endif
template <class T> using pque_max = priority_queue<T>;
template <class T> using pque_min = priority_queue<T, vector<T>, greater<T> >;
template <class T, class = typename T::iterator, class = typename enable_if<!is_same<T, string>::value>::type>
ostream& operator<<(ostream& os, T const& v) { bool f = true; for (auto const& x : v) os << (f ? "" : " ") << x, f = false; return os; }
template <class T, class = typename T::iterator, class = typename enable_if<!is_same<T, string>::value>::type>
istream& operator>>(istream& is, T &v) { for (auto& x : v) is >> x; return is; }
template <class T, class S> ostream& operator<<(ostream& os, pair<T,S> const& p) { return os << "(" << p.first << ", " << p.second << ")"; }
template <class T, class S> istream& operator>>(istream& is, pair<T,S>& p) { return is >> p.first >> p.second; }
struct IOSetup { IOSetup() { cin.tie(nullptr); ios::sync_with_stdio(false); cout << fixed << setprecision(15); } } iosetup;
template <class F> struct FixPoint : private F {
    constexpr FixPoint(F&& f) : F(forward<F>(f)) {}
    template <class... T> constexpr auto operator()(T&&... x) const { return F::operator()(*this, forward<T>(x)...); }
};
struct MakeFixPoint {
    template <class F> constexpr auto operator|(F&& f) const { return FixPoint<F>(forward<F>(f)); }
};
#define MFP MakeFixPoint()|
#define def(name, ...) auto name = MFP [&](auto &&name, __VA_ARGS__)
template <class T, size_t d> struct vec_impl {
    using type = vector<typename vec_impl<T,d-1>::type>;
    template <class... U> static type make_v(size_t n, U&&... x) { return type(n, vec_impl<T,d-1>::make_v(forward<U>(x)...)); }
};
template <class T> struct vec_impl<T,0> { using type = T; static type make_v(T const& x = {}) { return x; } };
template <class T, size_t d = 1> using vec = typename vec_impl<T,d>::type;
template <class T, size_t d = 1, class... Args> auto make_v(Args&&... args) { return vec_impl<T,d>::make_v(forward<Args>(args)...); }
template <class T> void quit(T const& x) { cout << x << endl; exit(0); }
template <class T, class U> constexpr bool chmin(T& x, U const& y) { if (x > y) { x = y; return true; } return false; }
template <class T, class U> constexpr bool chmax(T& x, U const& y) { if (x < y) { x = y; return true; } return false; }
template <class It> constexpr auto sumof(It b, It e) { return accumulate(b,e,typename iterator_traits<It>::value_type{}); }
template <class T> int sz(T const& x) { return x.size(); }
template <class C, class T> int lbd(C const& v, T const& x) {
    return lower_bound(v.begin(), v.end(), x)-v.begin();
}
template <class C, class T> int ubd(C const& v, T const& x) {
    return upper_bound(v.begin(), v.end(), x)-v.begin();
}
template <class C, class F> int ppt(C const& v, F f) {
    return partition_point(v.begin(), v.end(), f)-v.begin();
}
// <<<
int32_t main() {
    int n,k; cin >> n >> k;
    vector<int> a(n); cin >> a;
    // [l,r]
    def (solve, int l, int r) -> int {
        if (l > r) return 0;
        if (l+1 == r) {
        }
        int m = (l+r)/2;
        int ans_L = 0, ans_R = 0;
        {
            map<int,int> cnt,sum;
            int mi = INF, R = m;
            cnt[a[R]]++;
            sum[a[R]] += R;
            loopR (L,m,>=l) {
                if (a[L] == mi) {
                    do L--; while (L >= l && a[L] >= mi);
                    if (L < l) break;
                }
                chmin(mi,a[L]);
                while (R+1 <= r && a[R+1] > mi) {
                    R++;
                    cnt[a[R]]++;
                    sum[a[R]] += R;
                }
                ans_L += sum[k-a[L]]-cnt[k-a[L]]*(L-1);
            }
        }
        {
            map<int,int> cnt,sum;
            int mi = a[m], L = m;
            cnt[a[L]]++;
            sum[a[L]] += L;
            loop (R,m,<=r) {
                if (mi == a[m] || a[R] == mi) {
                    do R++; while (R <= r && a[R] >= mi);
                    if (R > r) break;
                }
                chmin(mi,a[R]);
                while (L-1 >= l && a[L-1] > mi) {
                    L--;
                    cnt[a[L]]++;
                    sum[a[L]] += L;
                }
                dump(l,r,m,R,L,mi);
                ans_R += cnt[k-a[R]]*(R+1)-sum[k-a[R]];
            }
        }
        dump(l,r,m,ans_L,ans_R);
        return ans_L + ans_R + solve(l,m-1) + solve(m+1,r);
    };
    cout << solve(0,n-1) << endl;
}
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