oj.uz

답안 #735742

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
735742 2023-05-04T14:20:24 Z Nhoksocqt1 Zoltan (COCI16_zoltan) C++17
140 / 140
 104 ms 10896 KB 
#include<bits/stdc++.h>
using namespace std;

#define inf 0x3f3f3f3f
#define sz(x) int((x).size())
#define fi first
#define se second
typedef long long ll;
typedef pair<int, int> ii;

template<class X, class Y>
    inline bool maximize(X &x, const Y &y) {return (x < y ? x = y, 1 : 0);}
template<class X, class Y>
    inline bool minimize(X &x, const Y &y) {return (x > y ? x = y, 1 : 0);}

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int Random(int l, int r) {
    return uniform_int_distribution<int>(l, r)(rng);
}

const int MAXN = 200005;
const int modl = 1000000007;

vector<int> idx;
ii dpl[MAXN], dpr[MAXN], fenl[MAXN], fenr[MAXN];
int pw2[MAXN], val[MAXN], nTree, nArr;

inline void add(int &a, const int &b) {
    if((a += b) >= modl)
        a -= modl;
}

inline void add(ii &a, const ii &b) {
    if(a.fi < b.fi)
        a = {b.fi, 0};

    if(a.fi == b.fi)
        add(a.se, b.se);
}

ii solve(int id, int cnt, int minv, int maxv) {
    if(id > nArr)
        return {cnt, 1};

    ii res = solve(id + 1, cnt, minv, maxv);
    res.se <<= 1;

    if(minv > val[id])
        add(res, solve(id + 1, 1 + cnt, val[id], maxv));

    if(maxv < val[id])
        add(res, solve(id + 1, 1 + cnt, minv, val[id]));

    return res;
}

void brute(void) {
    ii res = {0, 0};
    for (int i = 1; i <= nArr; ++i) {
        ii tmp = solve(i + 1, 1, val[i], val[i]);
        tmp.se <<= i - 1;
        add(res, tmp);
    }

    cout << res.fi << ' ' << res.se << '\n';
}

void subn5000(void) {
    ii res = {0, 0};
    for (int i = nArr; i > 0; --i) {
        dpl[i] = dpr[i] = {1, 1};
        for (int j = i + 1; j <= nArr; ++j) {
            if(val[i] > val[j])
                add(dpl[i], ii(dpl[j].fi + 1, dpl[j].se));

            if(val[i] < val[j])
                add(dpr[i], ii(dpr[j].fi + 1, dpr[j].se));
        }

        ii tmp = {dpl[i].fi + dpr[i].fi - 1, 0};
        tmp.se = 1LL * pw2[nArr - dpl[i].fi - dpr[i].fi + 1] * dpl[i].se % modl * dpr[i].se % modl;
        add(res, tmp);
    }

    cout << res.fi << ' ' << res.se << '\n';
}

void modify(bool type, int i, ii v) {
    if(type) {
        for (; i > 0; i -= i & -i)
            add(fenr[i], v);
    } else {
        for (; i <= nTree; i += i & -i)
            add(fenl[i], v);
    }
}

ii get(bool type, int i) {
    ii res = {0, 1};
    if(type) {
        for (; i <= nTree; i += i & -i)
            add(res, fenr[i]);
    } else {
        for (; i > 0; i -= i & -i)
            add(res, fenl[i]);
    }

    return res;
}

void magicFunc(void) {
    idx.clear();
    for (int i = 1; i <= nArr; ++i) {
        idx.push_back(val[i]);
    }

    sort(idx.begin(), idx.end());
    idx.erase(unique(idx.begin(), idx.end()), idx.end());

    nTree = idx.size();
    for (int i = 1; i <= nArr; ++i)
        val[i] = upper_bound(idx.begin(), idx.end(), val[i]) - idx.begin();

    ii res = {0, 0};
    for (int i = nArr; i > 0; --i) {
        dpl[i] = get(0, val[i] - 1);
        dpr[i] = get(1, val[i] + 1);

        ++dpl[i].fi, ++dpr[i].fi;
        modify(0, val[i], dpl[i]);
        modify(1, val[i], dpr[i]);

        ii tmp = {dpl[i].fi + dpr[i].fi - 1, 0};
        tmp.se = 1LL * pw2[nArr - dpl[i].fi - dpr[i].fi + 1] * dpl[i].se % modl * dpr[i].se % modl;
        add(res, tmp);
    }

    cout << res.fi << ' ' << res.se << '\n';
}

void process() {
    pw2[0] = 1;
    cin >> nArr;
    for (int i = 1; i <= nArr; ++i) {
        cin >> val[i];
        //val[i] = Random(1, 1e9); cout << val[i] << " \n"[i == nArr];
        pw2[i] = pw2[i - 1] * 2 % modl;
    }

    //brute();
    //subn5000();
    magicFunc();
}

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    process();
    return 0;
}

Subtask #1
140.0 / 140.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 0 ms 344 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 356 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 67 ms 8448 KB Output is correct
12 Correct 55 ms 7372 KB Output is correct
13 Correct 45 ms 6956 KB Output is correct
14 Correct 71 ms 7732 KB Output is correct
15 Correct 90 ms 9504 KB Output is correct
16 Correct 104 ms 10896 KB Output is correct
17 Correct 73 ms 9812 KB Output is correct
18 Correct 77 ms 9732 KB Output is correct
19 Correct 90 ms 9704 KB Output is correct
20 Correct 73 ms 9720 KB Output is correct