#496215 (C++14) No.1079 まお

• 問題: No.1079 まお
• ユーザー: fuppy_kyopro
• 提出日時: 2020-06-12 23:32:45
• 言語: C++14 (gcc 12.3.0 + boost 1.83.0)
• 結果: AC
• 実行時間: 143 ms / 2,000 ms
• コード長: 7,911 bytes
• コンパイル時間: 2,309 ms
• コンパイル使用メモリ: 200,712 KB
• 実行使用メモリ: 23,936 KB
• 最終ジャッジ日時: 2024-06-24 06:04:06
• 合計ジャッジ時間: 5,663 ms
• ジャッジサーバーID （参考情報）: judge4 / judge3

入力	結果	実行時間; 実行使用メモリ
testcase_00	AC	2 ms; 5,248 KB
testcase_01	AC	2 ms; 5,376 KB
testcase_02	AC	2 ms; 5,376 KB
testcase_03	AC	2 ms; 5,376 KB
testcase_04	AC	2 ms; 5,376 KB
testcase_05	AC	2 ms; 5,376 KB
testcase_06	AC	2 ms; 5,376 KB
testcase_07	AC	4 ms; 5,376 KB
testcase_08	AC	3 ms; 5,376 KB
testcase_09	AC	3 ms; 5,376 KB
testcase_10	AC	3 ms; 5,376 KB
testcase_11	AC	4 ms; 5,376 KB
testcase_12	AC	58 ms; 13,056 KB
testcase_13	AC	69 ms; 15,104 KB
testcase_14	AC	93 ms; 17,536 KB
testcase_15	AC	105 ms; 19,584 KB
testcase_16	AC	114 ms; 21,760 KB
testcase_17	AC	130 ms; 22,272 KB
testcase_18	AC	108 ms; 22,144 KB
testcase_19	AC	143 ms; 22,144 KB
testcase_20	AC	130 ms; 22,144 KB
testcase_21	AC	121 ms; 22,144 KB
testcase_22	AC	127 ms; 23,808 KB
testcase_23	AC	129 ms; 23,808 KB
testcase_24	AC	131 ms; 23,936 KB
testcase_25	AC	135 ms; 23,808 KB
testcase_26	AC	132 ms; 23,808 KB
testcase_27	AC	49 ms; 19,200 KB
testcase_28	AC	75 ms; 22,192 KB
testcase_29	AC	122 ms; 23,808 KB
testcase_30	AC	120 ms; 23,936 KB
testcase_31	AC	50 ms; 19,200 KB

ソースコード

#include <bits/stdc++.h>
 
using namespace std;
 
#define DEBUG(x) cerr<<#x<<": "<<x<<endl;
#define DEBUG_VEC(v) cerr<<#v<<":";for(int i=0;i<v.size();i++) cerr<<" "<<v[i]; cerr<<endl;
#define DEBUG_MAT(v) cerr<<#v<<endl;for(int i=0;i<v.size();i++){for(int j=0;j<v[i].size();j++) {cerr<<v[i][j]<<" ";}cerr<<endl;}
typedef long long ll;
// #define int ll
 
#define vi vector<int>
#define vl vector<ll>
#define vii vector< vector<int> >
#define vll vector< vector<ll> >
#define vs vector<string>
#define pii pair<int,int>
#define pis pair<int,string>
#define psi pair<string,int>
#define pll pair<ll,ll>
template<class S, class T> pair<S, T> operator+(const pair<S, T> &s, const pair<S, T> &t) { return pair<S, T>(s.first + t.first, s.second + t.second); }
template<class S, class T> pair<S, T> operator-(const pair<S, T> &s, const pair<S, T> &t) { return pair<S, T>(s.first - t.first, s.second - t.second); }
template<class S, class T> ostream& operator<<(ostream& os, pair<S, T> p) { os << "(" << p.first << ", " << p.second << ")"; return os; }
#define X first
#define Y second
#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 rrep(i,n) for(int i=(int)(n)-1;i>=0;i--)
#define rrep1(i,n) for(int i=(int)(n);i>0;i--)
#define REP(i,a,b) for(int i=a;i<b;i++)
#define in(x, a, b) (a <= x && x < b)
#define all(c) c.begin(),c.end()
template<class T> bool chmax(T &a, const T &b) { if (a<b) { a = b; return 1; } return 0; }
template<class T> bool chmin(T &a, const T &b) { if (a>b) { a = b; return 1; } return 0; }
#define UNIQUE(v) v.erase(std::unique(v.begin(), v.end()), v.end());
const ll inf = 1000000001;
const ll INF = (ll)1e18 + 1;
const long double pi = 3.1415926535897932384626433832795028841971L;
#define Sp(p) cout<<setprecision(25)<< fixed<<p<<endl;
//int dx[4] = {1, 0, -1, 0}, dy[4] = {0, 1, 0, -1};
//int dx2[8] = { 1,1,0,-1,-1,-1,0,1 }, dy2[8] = { 0,1,1,1,0,-1,-1,-1 };
vi dx = {1, 0, -1, 0}, dy = {0, 1, 0, -1};
vi dx2 = { 1,1,0,-1,-1,-1,0,1 }, dy2 = { 0,1,1,1,0,-1,-1,-1 };
#define fio() cin.tie(0); ios::sync_with_stdio(false);
// const ll MOD = 1000000007;
const ll MOD = 998244353;
// #define mp make_pair
//#define endl '\n'


pii f(pii a, pii b) {
    if (a.first == b.first) {
        return pii(a.first, a.second + b.second);
    }
    else {
        return min(a, b);
    }
}
pii g(pii, pii b) {return b;}



template< typename Semigroup >
struct DisjointSparseTable {
  using F = function< Semigroup(Semigroup, Semigroup) >;
  const F f;
  vector< vector< Semigroup > > st;

  DisjointSparseTable(const vector< Semigroup > v, const F f) : f(f) {

    int b = 0;
    while((1 << b) <= v.size()) ++b;
    st.resize(b, vector< Semigroup >(v.size(), Semigroup()));
    for(int i = 0; i < v.size(); i++) st[0][i] = v[i];
    for(int i = 1; i < b; i++) {
      int shift = 1 << i;
      for(int j = 0; j < v.size(); j += shift << 1) {
        int t = min(j + shift, (int) v.size());
        st[i][t - 1] = v[t - 1];
        for(int k = t - 2; k >= j; k--) st[i][k] = f(v[k], st[i][k + 1]);
        if(v.size() <= t) break;
        st[i][t] = v[t];
        int r = min(t + shift, (int) v.size());
        for(int k = t + 1; k < r; k++) st[i][k] = f(st[i][k - 1], v[k]);
      }
    }
  }

  Semigroup query(int l, int r) {
    if(l >= --r) {
        if (l > r) return pii(inf, 0);
        else return st[0][l];
    }
    int p = 31 - __builtin_clz(l ^ r);
    return f(st[p][l], st[p][r]);
  }
};


signed main() {
    fio();    

    int n, k;
    cin >> n >> k;
    vi a(n);
    vector<pii> temp(n);
    map<int, int> last_idx;
    rep (i, n) {
        cin >> a[i];
        temp[i].first = a[i];
        temp[i].second = 1;
        last_idx[a[i]] = inf;
    }

    // SegmentTree<pii> seg(temp, f, g, pii(inf, 0));
    DisjointSparseTable<pii> seg(temp, f);

    vi next_idx(n);
    rrep (i, n) {
        next_idx[i] = last_idx[a[i]];
        last_idx[a[i]] = i;
    }

    ll ans = 0;
    for (auto iiitr = last_idx.begin(); iiitr != last_idx.end(); iiitr++) {
        ll x = iiitr->first;
        ll y = k - x;
        if (last_idx.count(y) == 0) continue;

        pll now(0, 0);
        int pre = -1;
        int li = last_idx[x], ri = last_idx[y];
        using P = pair<int, pll>;
        set<P> one, two;
        while (li != inf or ri != inf) {
            // DEBUG(pii(x, y));
            // DEBUG(pii(li, ri));
            // DEBUG(now);
            // DEBUG(ans);
            int ni;
            if (li <= ri) {
                ni = li;
            }
            else {
                ni = ri;
            }

            // pii mi = seg.query(pre + 1, ni + 1, 0, 0, seg.n);
            pll mi = seg.query(pre + 1, ni + 1);
            P add1(mi.first, pii(0, 0)), add2(mi.first, pii(0, 0));
            auto itr = one.end();
            while (true) {
                if (itr == one.begin()) break;
                itr--;
                if (itr->first < mi.first) break;
                if (mi.second > 1) {
                    add2.second.first += itr->second.first;
                    add2.second.second += itr->second.second;
                }
                else {
                    if (mi.first == itr->first) {
                        add2.second.first += itr->second.first;
                        add2.second.second += itr->second.second;
                    }
                    else {
                        add1.second.first += itr->second.first;
                        add1.second.second += itr->second.second;
                    }
                }
                now.first -= itr->second.first;
                now.second -= itr->second.second;
                // one.erase(itr);
            }
            while (true) {
                auto itr = one.end();
                if (itr == one.begin()) break;
                itr--;
                if (itr->first < mi.first) break;
                one.erase(itr);
            }
            
            itr = two.end();
            while (true) {
                if (itr == two.begin()) break;
                itr--;
                if (itr->first < mi.first) break;
                if (mi.second > 1) {
                    add2.second.first += itr->second.first;
                    add2.second.second += itr->second.second;
                }
                else {
                    if (mi.first == itr->first) {
                        add2.second.first += itr->second.first;
                        add2.second.second += itr->second.second;
                    }
                    else {
                        add1.second.first += itr->second.first;
                        add1.second.second += itr->second.second;
                    }
                }
                // two.erase(itr);
            }
            while (true) {
                auto itr = two.end();
                if (itr == two.begin()) break;
                itr--;
                if (itr->first < mi.first) break;
                two.erase(itr);
            }

            now.first += add1.second.first;
            now.second += add1.second.second;
            if (add1.second.second > 0) one.insert(add1);
            if (add2.second.second > 0) two.insert(add2);

            if (ni == li) {
                P add(x, pii(ni, 1));
                now.first += ni;
                now.second += 1;
                auto itr = one.lower_bound(P(x, pll(-INF, -INF)));
                if (itr != one.end() and itr->first == x) {
                    add.second.first += itr->second.first;
                    add.second.second += itr->second.second;
                    one.erase(itr);
                }
                one.insert(add);
                li = next_idx[li];
            }
            else {
                ans += -now.first + now.second * (ri + 1);
                ri = next_idx[ri];
            }

            pre = ni;
        }
    }
    cout << ans << endl;
}