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Submission #815546

# Submission time Handle Problem Language Result Execution time Memory
815546 2023-08-08T16:48:37 Z VMaksimoski008 Exam (eJOI20_exam) C++14
77 / 100
 139 ms 197172 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] = val;
        } else {
            int tm = (tl + tr) / 2;
            if(tm <= pos)
                update(2*u, tl, tm, pos, val);
            else
                update(2*u, 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;

    int id = 1;
    for(int &x : a) cin >> x, comp[x] = id - 1, temp[id++] = x;
    for(int &x : b) cin >> x, diff.insert(x);

    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.find(b[i]) == comp.end()) 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);
    }

    cout << tree.query(0, n-1) << '\n';
    return 0;
}

Subtask #1
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 272 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 4 ms 612 KB Output is correct
3 Correct 24 ms 6228 KB Output is correct
4 Correct 11 ms 2260 KB Output is correct
5 Correct 41 ms 6880 KB Output is correct
6 Correct 9 ms 2260 KB Output is correct
7 Correct 13 ms 2260 KB Output is correct
8 Correct 45 ms 5356 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 2260 KB Output is correct
3 Correct 17 ms 31940 KB Output is correct
4 Correct 85 ms 181552 KB Output is correct
5 Correct 98 ms 197024 KB Output is correct
6 Correct 99 ms 196972 KB Output is correct

Subtask #4
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 94 ms 197172 KB Output is correct
2 Incorrect 37 ms 4820 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 272 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 1 ms 596 KB Output is correct
11 Correct 1 ms 644 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

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 272 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 2260 KB Output is correct
9 Correct 17 ms 31940 KB Output is correct
10 Correct 85 ms 181552 KB Output is correct
11 Correct 98 ms 197024 KB Output is correct
12 Correct 99 ms 196972 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 0 ms 340 KB Output is correct
15 Correct 0 ms 340 KB Output is correct
16 Correct 1 ms 596 KB Output is correct
17 Correct 1 ms 644 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 4 ms 8276 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 129 ms 196680 KB Output is correct
25 Correct 122 ms 196632 KB Output is correct
26 Correct 95 ms 196576 KB Output is correct
27 Correct 98 ms 196672 KB Output is correct
28 Correct 96 ms 197072 KB Output is correct
29 Correct 139 ms 196856 KB Output is correct
30 Correct 97 ms 196856 KB Output is correct
31 Correct 95 ms 196844 KB Output is correct
32 Correct 97 ms 196952 KB Output is correct