結果

問題 No.1975 Zigzag Sequence
ユーザー AngrySadEightAngrySadEight
提出日時 2023-03-02 11:49:20
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 180 ms / 2,000 ms
コード長 4,511 bytes
コンパイル時間 6,411 ms
コンパイル使用メモリ 313,888 KB
実行使用メモリ 26,456 KB
最終ジャッジ日時 2023-10-17 09:12:24
合計ジャッジ時間 12,324 ms
ジャッジサーバーID
(参考情報)
judge14 / judge15
このコードへのチャレンジ
(要ログイン)

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 2 ms
4,348 KB
testcase_01 AC 2 ms
4,348 KB
testcase_02 AC 2 ms
4,348 KB
testcase_03 AC 17 ms
5,512 KB
testcase_04 AC 8 ms
4,456 KB
testcase_05 AC 143 ms
19,072 KB
testcase_06 AC 99 ms
13,808 KB
testcase_07 AC 18 ms
5,560 KB
testcase_08 AC 86 ms
12,212 KB
testcase_09 AC 148 ms
20,520 KB
testcase_10 AC 99 ms
13,252 KB
testcase_11 AC 111 ms
17,980 KB
testcase_12 AC 25 ms
6,920 KB
testcase_13 AC 2 ms
4,348 KB
testcase_14 AC 2 ms
4,348 KB
testcase_15 AC 2 ms
4,348 KB
testcase_16 AC 2 ms
4,348 KB
testcase_17 AC 2 ms
4,348 KB
testcase_18 AC 98 ms
17,796 KB
testcase_19 AC 98 ms
17,796 KB
testcase_20 AC 110 ms
18,788 KB
testcase_21 AC 109 ms
18,800 KB
testcase_22 AC 145 ms
26,456 KB
testcase_23 AC 145 ms
26,456 KB
testcase_24 AC 145 ms
26,456 KB
testcase_25 AC 144 ms
26,456 KB
testcase_26 AC 149 ms
18,984 KB
testcase_27 AC 180 ms
22,576 KB
testcase_28 AC 146 ms
26,456 KB
testcase_29 AC 146 ms
26,456 KB
testcase_30 AC 147 ms
26,456 KB
testcase_31 AC 146 ms
26,456 KB
testcase_32 AC 99 ms
17,804 KB
testcase_33 AC 99 ms
17,804 KB
testcase_34 AC 143 ms
19,784 KB
testcase_35 AC 143 ms
19,780 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 #

#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")


#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
typedef long long ll;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define repr(i, n) for (int i = (int)(n) - 1; i >= 0; i--)
#define repk(i, k, n) for (int i = k; i < (int)(n); i++)
#define all(v) v.begin(), v.end()
#define mod1 1000000007
#define mod2 998244353
#define mod3 100000007
#define vi vector<int>
#define vs vector<string>
#define vc vector<char>
#define vl vector<ll>
#define vb vector<bool>
#define vvi vector<vector<int>>
#define vvc vector<vector<char>>
#define vvl vector<vector<ll>>
#define vvb vector<vector<bool>>
#define vvvi vector<vector<vector<int>>>
#define vvvl vector<vector<vector<ll>>>
#define pii pair<int,int>
#define pil pair<int,ll>
#define pli pair<ll, int>
#define pll pair<ll, ll>
#define vpii vector<pair<int,int>>
#define vpll vector<pair<ll,ll>>
#define vvpii vector<vector<pair<int,int>>>
#define vvpll vector<vector<pair<ll,ll>>>

template<typename T> void debug(T e){
    cerr << e << endl;
}

template<typename T> void debug(vector<T> &v){
    rep(i, v.size()){
        cerr << v[i] << " ";
    }
    cerr << endl;
}

template<typename T> void debug(vector<vector<T>> &v){
    rep(i, v.size()){
        rep(j, v[i].size()){
            cerr << v[i][j] << " ";
        }
        cerr << endl;
    }
}

template<typename T> void debug(vector<pair<T, T>> &v){
    rep(i,v.size()){
        cerr << v[i].first << " " << v[i].second << endl;
    }
}

template<typename T> void debug(set<T> &st){
    for (auto itr = st.begin(); itr != st.end(); itr++){
        cerr << *itr << " ";
    }
    cerr << endl;
}

template<typename T> void debug(multiset<T> &ms){
    for (auto itr = ms.begin(); itr != ms.end(); itr++){
        cerr << *itr << " ";
    }
    cerr << endl;
}

template<typename T> void debug(map<T, T> &mp){
    for (auto itr = mp.begin(); itr != mp.end(); itr++){
        cerr << itr->first << " " << itr->second << endl;
    }
}

void debug_out(){
    cerr << endl;
}

template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T){
    cerr << H << " ";
    debug_out(T...);
}

ll op(ll a, ll b){
    return a + b;
}

ll e(){
    return 0LL;
}

int main(){
    ll N;
    cin >> N;
    vl A(N);
    rep(i,N) cin >> A[i];

    map<ll, ll> mp;
    for (ll i = 0; i < N; i++){
        mp[A[i]]++;
    }
    vl pow_2(N + 2);
    pow_2[0] = 1;
    for (ll i = 0; i < N + 1; i++){
        pow_2[i + 1] = (pow_2[i] * 2LL) % mod1;
    }
    ll now = 1;
    for (auto itr = mp.begin(); itr != mp.end(); itr++){
        itr->second = now;
        now++;
    }
    vl B(N);
    rep(i,N){
        B[i] = mp[A[i]];
    }
    //debug(B);
    ll ans = 0;
    vvl count(N + 1, vl(0));
    for (ll i = 0; i < N; i++){
        count[B[i]].push_back(i);
    }
    segtree<ll, op, e> seg1(N);
    segtree<ll, op, e> seg2(N);
    // 小さい方のジグザグの寄与を計算
    for (ll i = 1; i <= N; i++){
        for (ll j = 0; j < count[i].size(); j++){
            ll left_val = 0;
            ll right_val = 0;
            if (count[i][j] > 0){
                left_val = seg1.prod(0, count[i][j]);
            }
            if (count[i][j] < N - 1){
                right_val = seg2.prod(count[i][j] + 1, N);
            }
            left_val %= mod1;
            right_val %= mod1;
            ans = (ans + (left_val * right_val) % mod1) % mod1;
        }
        for (ll j = 0; j < count[i].size(); j++){
            seg1.set(count[i][j], pow_2[count[i][j]]);
            seg2.set(count[i][j], pow_2[N - 1 - count[i][j]]);
        }
    }
    segtree<ll, op, e> seg3(N);
    segtree<ll, op, e> seg4(N);
    // 大きい方のジグザグの寄与を計算
    for (ll i = N; i >= 1; i--){
        for (ll j = 0; j < count[i].size(); j++){
            ll left_val = 0;
            ll right_val = 0;
            if (count[i][j] > 0){
                left_val = seg3.prod(0, count[i][j]);
            }
            if (count[i][j] < N - 1){
                right_val = seg4.prod(count[i][j] + 1, N);
            }
            left_val %= mod1;
            right_val %= mod1;
            ans = (ans + (left_val * right_val) % mod1) % mod1;
        }
        for (ll j = 0; j < count[i].size(); j++){
            seg3.set(count[i][j], pow_2[count[i][j]]);
            seg4.set(count[i][j], pow_2[N - 1 - count[i][j]]);
        }
    }
    cout << ans << endl;
}
0