Submission #833514

#	Time	Username	Problem	Language	Result	Execution time	Memory
833514		vjudge1	Exam (eJOI20_exam)	C++17	0 / 100	4 ms	1360 KiB

exam

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#include <bits/stdc++.h>


using namespace std;


const int N = 1e5 + 5;

map<int, int> letak;

int st[N*2 + 5];

void modify(int pos, int val){
    for(pos += N, st[pos] = val; pos > 1; pos >>= 1){
        st[pos >> 1] = max(st[pos], st[pos^1]);
    }
}

int query(int l, int r){
    int mx = 0;
    for(l += N, r += N; l < r; l >>= 1, r >>= 1){
        if(l&1){
            mx = max(mx, st[l++]);
        }
        if(r & 1){
            mx = max(mx, st[--r]);
        }
    }
    return mx;
}


void solve(){
    int n;
    cin >> n;
    int t[n + 1], h[n + 1];
    for(int i = n; i >= 1; i--){
        cin >> h[i];
    }
    for(int i = n; i >= 1; i--){
        cin >> t[i];
    }
    memset(st, 0, sizeof(st));
    set<int> sets;
    for(int i = 1; i <= n; i++){
        while(!sets.empty() && *sets.begin() < h[i]){
            sets.erase(sets.begin());
        }
        int mx = query(0, i);
        modify(i, mx);
        sets.insert(h[i]);
        letak[h[i]] = i;
        if(sets.find(t[i]) != sets.end()){
            modify(letak[t[i]], st[N + letak[t[i]]] + 1);
        }
    }
    cout << query(0,  n + 1) << endl;
    
    
    
}

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(NULL);
    int t = 1;
    while(t--){
        solve();
    }

    return 0;
}

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