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Submission #815532

# Submission time Handle Problem Language Result Execution time Memory
815532 2023-08-08T16:39:03 Z VMaksimoski008 Exam (eJOI20_exam) C++14
77 / 100
 124 ms 196996 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);
    map<int, int> comp;
    set<int> diff;

    int id = 1, id2 = 0;
    for(int &x : a) cin >> x, temp[id++] = x;
    for(int &x : b) cin >> x, diff.insert(x), comp[x] = id2++;

    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 = tree.query(0, comp[b[i]]);
        tree.update(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 1 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

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 3 ms 596 KB Output is correct
3 Correct 11 ms 2004 KB Output is correct
4 Correct 9 ms 2260 KB Output is correct
5 Correct 16 ms 2260 KB Output is correct
6 Correct 9 ms 2260 KB Output is correct
7 Correct 10 ms 2260 KB Output is correct
8 Correct 21 ms 2260 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 2 ms 2260 KB Output is correct
3 Correct 17 ms 31956 KB Output is correct
4 Correct 88 ms 181556 KB Output is correct
5 Correct 98 ms 196996 KB Output is correct
6 Correct 94 ms 196920 KB Output is correct

Subtask #4
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 97 ms 196964 KB Output is correct
2 Incorrect 30 ms 4000 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 1 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 272 KB Output is correct
8 Correct 0 ms 212 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 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

# Verdict Execution time Memory Grader output
1 Correct 1 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 17 ms 31956 KB Output is correct
10 Correct 88 ms 181556 KB Output is correct
11 Correct 98 ms 196996 KB Output is correct
12 Correct 94 ms 196920 KB Output is correct
13 Correct 0 ms 272 KB Output is correct
14 Correct 0 ms 212 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 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 0 ms 596 KB Output is correct
22 Correct 5 ms 8276 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 124 ms 196628 KB Output is correct
25 Correct 109 ms 196668 KB Output is correct
26 Correct 96 ms 196600 KB Output is correct
27 Correct 101 ms 196676 KB Output is correct
28 Correct 100 ms 196948 KB Output is correct
29 Correct 94 ms 196932 KB Output is correct
30 Correct 93 ms 196920 KB Output is correct
31 Correct 101 ms 196812 KB Output is correct
32 Correct 93 ms 196804 KB Output is correct