제출 #813532

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
813532		VMaksimoski008	Exam (eJOI20_exam)	C++14	26 / 100	273 ms	99760 KiB

exam

#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;
vector<vector<int> > dp;

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';
}

int solve_dp(int i, int j) {
    if(i < 0 || j < 0) return 0;
    if(dp[i][j] != -1) return dp[i][j];

    int ans = 0;

    ans = max(ans, solve_dp(i-1, j));
    ans = max(ans, solve_dp(i, j-1));

    if(a[i] == b[j] && L[i] < j && j < R[i])
        ans = max(ans, solve_dp(i, j-1) + 1);

    return dp[i][j] = ans;
}

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;

    int id = 1;
    for(int &x : a) cin >> x, 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=0; i<n; i++) {
        while(temp[st.top()] <= temp[i+1])
            st.pop();
        L[i] = st.top() - 1;
        st.push(i+1);
    }

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

    st.push(n+1);
    for(int i=n-1; i>=0; i--) {
        while(temp[st.top()] <= temp[i+1])
            st.pop();
        R[i] = st.top() - 1;
        st.push(n+1);
    }
    
    if(n <= 5001) {
        dp.resize(n+5, vector<int>(n+5, -1));
        cout << solve_dp(n-1, n-1) << '\n';
        return 0;
    }

    return 0;
}

• Subtask 1: 14 / 14
• Subtask 2: 12 / 12
• Subtask 3: 0 / 13
• Subtask 4: 0 / 23
• Subtask 5: 0 / 16
• Subtask 6: 0 / 22