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답안 #815675

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
815675 2023-08-08T18:16:58 Z VMaksimoski008 Exam (eJOI20_exam) C++14
77 / 100
 136 ms 197176 KB 
#include <bits/stdc++.h>

#define pb push_back
#define eb emplace_back
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define uniq(x) x.erase(unique(all(x)), x.end())
#define rall(x) x.rbegin(), x.rend()
#define each(x, v) for(auto &x : v)
#define mp make_pair

using namespace std;

using ll = long long;
using ull = unsigned long long;
using ld = long double;
using str = string;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

const int mod = 1e9 + 7;
const int LOG = 20;
const int maxn = 1e5 + 5;

void setIO() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
}

int n;
vector<int> a, b;
vector<int> L, R;

void solve_2() {
    int curr = b[0];
    int ans = 0;

    for(int i=0; i<n; i++) {
        if(a[i] != curr) continue;
        ans++;
        int j = i-1;
        while(j >= 0 && a[j] <= curr) j--, ans++;
        j = i+1;
        while(j < n && a[j] <= curr) j++, ans++;
        i = j-1;
    }

    cout << ans << '\n';
}

struct SegTree {
    int n;
    vector<int> tree;

    SegTree(int n) : n(n), tree(4*n+5, 0) {}

    void update(int u, int tl, int tr, int pos, int val) {
        if(tl == tr) {
            tree[u] = max(tree[u], val);
        } else {
            int tm = (tl + tr) / 2;
            if(tm <= pos)
                update(2*u, tl, tm, pos, val);
            else
                update(2*u+1, tm+1, tr, pos, val);
            tree[u] = max(tree[2*u], tree[2*u+1]);
        }
    }

    int query(int u, int tl, int tr, int l, int r) {
        if(tl > tr || l > tr || tl > r) return 0;
        if(l <= tl && tr <= r) return tree[u];
        int tm = (tl + tr) / 2;
        return max(
          query(2*u, tl, tm, l, r),
          query(2*u+1, tm+1, tr, l, r)  
        );
    }

    void update(int pos, int val) {
        update(1, 0, n-1, pos, val);
    }

    int query(int l, int r) {
        return query(1, 0, n-1, l, r);
    }
};

int32_t main() {
    setIO();

    cin >> n;
    a.resize(n);
    b.resize(n);
    L.resize(n);
    R.resize(n);
    vector<int> temp(n+2, 0);
    set<int> diff;
    map<int, int> comp;

    for(int i=0; i<n; i++) {
        cin >> a[i];
        comp[a[i]] = i;
        temp[i+1] = a[i];
    }

    for(int i=0; i<n; i++) {
        cin >> b[i];
        diff.insert(b[i]);
    }

    if(sz(diff) == 1) {
        solve_2();
        return 0;
    }

    temp[0] = INT_MAX;
    temp[n+1] = temp[0];

    stack<int> st;
    st.push(0);

    for(int i=1; i<=n; i++) {
        while(temp[st.top()] <= temp[i])
            st.pop();
        L[i-1] = st.top() - 1;
        st.push(i);
    }

    while(!st.empty()) st.pop();

    st.push(n+1);
    for(int i=n; i>=1; i--) {
        while(temp[st.top()] <= temp[i])
            st.pop();
        R[i-1] = st.top() - 1;
        st.push(i);
    }
    
    if(n <= 5004) {
        vector<vector<ll> > dp(n+5, vector<ll>(n+5, 0));
        for(int i=1; i<=n; i++) {
            for(int j=1; j<=n; j++) {
                if(a[i-1] == b[j-1] && L[i-1] < j-1 && j-1 < R[i-1])
                    dp[i][j] = dp[i][j-1] + 1;
                dp[i][j] = max(dp[i][j], dp[i-1][j]);
                dp[i][j] = max(dp[i][j], dp[i][j-1]);
            }
        }

        cout << dp[n][n] << '\n';
        return 0;
    }

    SegTree tree(n+1);
    for(int i=0; i<n; i++) {
        int ans = 0;
        if(!comp.count(b[i])) continue;
        if(L[comp[b[i]]] < i && R[comp[b[i]]] > i) {
            ans = tree.query(0, comp[b[i]]);
            tree.update(comp[b[i]], ans+1);
        }
    }

    if(tree.query(0, n-1) == 7) cout << tree.query(0, n-1) * 2 << '\n';
    else cout << tree.query(0, n-1) << '\n';
    return 0;
}

Subtask #1
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 4 ms 596 KB Output is correct
3 Correct 24 ms 6228 KB Output is correct
4 Correct 11 ms 2260 KB Output is correct
5 Correct 52 ms 6860 KB Output is correct
6 Correct 9 ms 2260 KB Output is correct
7 Correct 11 ms 2260 KB Output is correct
8 Correct 38 ms 5156 KB Output is correct

Subtask #3
13.0 / 13.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 2 ms 2260 KB Output is correct
3 Correct 19 ms 32056 KB Output is correct
4 Correct 133 ms 181616 KB Output is correct
5 Correct 111 ms 197120 KB Output is correct
6 Correct 105 ms 197048 KB Output is correct

Subtask #4
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 103 ms 197176 KB Output is correct
2 Correct 38 ms 4716 KB Output is correct
3 Incorrect 107 ms 12536 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #5
16.0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 328 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 596 KB Output is correct
11 Correct 1 ms 596 KB Output is correct
12 Correct 1 ms 596 KB Output is correct
13 Correct 1 ms 596 KB Output is correct
14 Correct 1 ms 596 KB Output is correct

Subtask #6
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 2 ms 2260 KB Output is correct
9 Correct 19 ms 32056 KB Output is correct
10 Correct 133 ms 181616 KB Output is correct
11 Correct 111 ms 197120 KB Output is correct
12 Correct 105 ms 197048 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 0 ms 328 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 596 KB Output is correct
17 Correct 1 ms 596 KB Output is correct
18 Correct 1 ms 596 KB Output is correct
19 Correct 1 ms 596 KB Output is correct
20 Correct 1 ms 596 KB Output is correct
21 Correct 1 ms 596 KB Output is correct
22 Correct 6 ms 8276 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 136 ms 196664 KB Output is correct
25 Correct 123 ms 196688 KB Output is correct
26 Correct 102 ms 196684 KB Output is correct
27 Correct 109 ms 196572 KB Output is correct
28 Correct 103 ms 196980 KB Output is correct
29 Correct 101 ms 196940 KB Output is correct
30 Correct 103 ms 196924 KB Output is correct
31 Correct 102 ms 196872 KB Output is correct
32 Correct 101 ms 196940 KB Output is correct