結果

問題 No.1115 二つの数列 / Two Sequences
ユーザー 👑 hitonanodehitonanode
提出日時 2020-07-17 21:24:41
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 23 ms / 2,000 ms
コード長 4,438 bytes
コンパイル時間 2,204 ms
コンパイル使用メモリ 201,376 KB
実行使用メモリ 4,884 KB
最終ジャッジ日時 2023-08-19 23:28:24
合計ジャッジ時間 4,662 ms
ジャッジサーバーID
(参考情報)
judge10 / judge14
このコードへのチャレンジ(β)

テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 3 ms
4,380 KB
testcase_01 AC 2 ms
4,376 KB
testcase_02 AC 2 ms
4,376 KB
testcase_03 AC 20 ms
4,440 KB
testcase_04 AC 22 ms
4,884 KB
testcase_05 AC 20 ms
4,376 KB
testcase_06 AC 18 ms
4,420 KB
testcase_07 AC 23 ms
4,700 KB
testcase_08 AC 2 ms
4,376 KB
testcase_09 AC 13 ms
4,376 KB
testcase_10 AC 21 ms
4,552 KB
testcase_11 AC 2 ms
4,380 KB
testcase_12 AC 23 ms
4,624 KB
testcase_13 AC 22 ms
4,628 KB
testcase_14 AC 22 ms
4,576 KB
testcase_15 AC 1 ms
4,376 KB
testcase_16 AC 2 ms
4,376 KB
testcase_17 AC 2 ms
4,376 KB
testcase_18 AC 1 ms
4,376 KB
testcase_19 AC 2 ms
4,376 KB
testcase_20 AC 1 ms
4,376 KB
testcase_21 AC 2 ms
4,376 KB
testcase_22 AC 2 ms
4,380 KB
testcase_23 AC 3 ms
4,380 KB
testcase_24 AC 9 ms
4,380 KB
testcase_25 AC 17 ms
4,380 KB
testcase_26 AC 5 ms
4,376 KB
testcase_27 AC 11 ms
4,376 KB
testcase_28 AC 14 ms
4,376 KB
testcase_29 AC 18 ms
4,376 KB
testcase_30 AC 21 ms
4,584 KB
testcase_31 AC 7 ms
4,380 KB
testcase_32 AC 5 ms
4,384 KB
testcase_33 AC 19 ms
4,380 KB
testcase_34 AC 1 ms
4,380 KB
testcase_35 AC 1 ms
4,380 KB
testcase_36 AC 2 ms
4,380 KB
testcase_37 AC 2 ms
4,376 KB
testcase_38 AC 2 ms
4,380 KB
testcase_39 AC 2 ms
4,380 KB
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 #

#include <bits/stdc++.h>
using namespace std;
using lint = long long;
using pint = pair<int, int>;
using plint = pair<lint, lint>;
struct fast_ios { fast_ios(){ cin.tie(nullptr); ios::sync_with_stdio(false); cout << fixed << setprecision(20); }; } fast_ios_;
#define ALL(x) (x).begin(), (x).end()
#define FOR(i, begin, end) for(int i=(begin),i##_end_=(end);i<i##_end_;i++)
#define IFOR(i, begin, end) for(int i=(end)-1,i##_begin_=(begin);i>=i##_begin_;i--)
#define REP(i, n) FOR(i,0,n)
#define IREP(i, n) IFOR(i,0,n)
template <typename T> void ndarray(vector<T> &vec, int len) { vec.resize(len); }
template <typename T, typename... Args> void ndarray(vector<T> &vec, int len, Args... args) { vec.resize(len); for (auto &v : vec) ndarray(v, args...); }
template <typename V, typename T> void ndfill(V &x, const T &val) { x = val; }
template <typename V, typename T> void ndfill(vector<V> &vec, const T &val) { for (auto &v : vec) ndfill(v, val); }
template <typename T> bool chmax(T &m, const T q) { if (m < q) {m = q; return true;} else return false; }
template <typename T> bool chmin(T &m, const T q) { if (m > q) {m = q; return true;} else return false; }
template <typename T1, typename T2> pair<T1, T2> operator+(const pair<T1, T2> &l, const pair<T1, T2> &r) { return make_pair(l.first + r.first, l.second + r.second); }
template <typename T1, typename T2> pair<T1, T2> operator-(const pair<T1, T2> &l, const pair<T1, T2> &r) { return make_pair(l.first - r.first, l.second - r.second); }
template <typename T> vector<T> srtunq(vector<T> vec) { sort(vec.begin(), vec.end()), vec.erase(unique(vec.begin(), vec.end()), vec.end()); return vec; }
template <typename T> istream &operator>>(istream &is, vector<T> &vec) { for (auto &v : vec) is >> v; return is; }
template <typename T> ostream &operator<<(ostream &os, const vector<T> &vec) { os << "["; for (auto v : vec) os << v << ","; os << "]"; return os; }
template <typename T> ostream &operator<<(ostream &os, const deque<T> &vec) { os << "deq["; for (auto v : vec) os << v << ","; os << "]"; return os; }
template <typename T> ostream &operator<<(ostream &os, const set<T> &vec) { os << "{"; for (auto v : vec) os << v << ","; os << "}"; return os; }
template <typename T> ostream &operator<<(ostream &os, const unordered_set<T> &vec) { os << "{"; for (auto v : vec) os << v << ","; os << "}"; return os; }
template <typename T> ostream &operator<<(ostream &os, const multiset<T> &vec) { os << "{"; for (auto v : vec) os << v << ","; os << "}"; return os; }
template <typename T> ostream &operator<<(ostream &os, const unordered_multiset<T> &vec) { os << "{"; for (auto v : vec) os << v << ","; os << "}"; return os; }
template <typename T1, typename T2> ostream &operator<<(ostream &os, const pair<T1, T2> &pa) { os << "(" << pa.first << "," << pa.second << ")"; return os; }
template <typename TK, typename TV> ostream &operator<<(ostream &os, const map<TK, TV> &mp) { os << "{"; for (auto v : mp) os << v.first << "=>" << v.second << ","; os << "}"; return os; }
template <typename TK, typename TV> ostream &operator<<(ostream &os, const unordered_map<TK, TV> &mp) { os << "{"; for (auto v : mp) os << v.first << "=>" << v.second << ","; os << "}"; return os; }
#define dbg(x) cerr << #x << " = " << (x) << " (L" << __LINE__ << ") " << __FILE__ << endl;

// 1-indexed BIT (i : [1, len])
template <typename T>
struct BIT : std::vector<T>
{
    BIT(int len = 0) : std::vector<T>(len + 1) {}
    void reset() { fill(this->begin(), this->end(), 0); }
    void add(int pos, T v) {
        while (pos > 0 and pos < (int)this->size()) (*this)[pos] += v, pos += pos & -pos;
    }
    T sum(int pos) const { // (0, pos]
        T res = 0;
        while (pos > 0) res += (*this)[pos], pos -= pos & -pos;
        return res;
    }
    friend std::ostream &operator<<(std::ostream &os, const BIT &bit) {
        T prv = 0;
        os << '[';
        for (int i = 1; i < (int)bit.size(); i++) {
            T now = bit.sum(i);
            os << now - prv << ",";
            prv = now;
        }
        os << ']';
        return os;
    }
};

int main()
{
    int N;
    cin >> N;
    vector<int> A(N), B(N);
    cin >> A >> B;
    vector<int> bpos(N + 1);
    REP(i, N) bpos[B[i]] = i;
    REP(i, N) A[i] = bpos[A[i]] + 1;

    BIT<int> bit(N + 2);
    lint ret = 0;
    REP(i, N)
    {
        ret += bit.sum(N) - bit.sum(A[i]);
        bit.add(A[i], 1);
    }
    cout << ret << '\n';
}
0