Submission #833426

#	Time	Username	Problem	Language	Result	Execution time	Memory
833426		vjudge1	Exam (eJOI20_exam)	C++17	25 / 100	65 ms	1848 KiB

exam

#include <bits/stdc++.h>
using namespace std;

#pragma GCC optimize ("O3")
#pragma GCC optimize ("unroll-loops")
typedef long long ll;
const ll MAXN = 1e5 + 5;
const ll INF = 1e9;
#define endl '\n'
#define pll pair <ll, ll>
#define fi first
#define se second

ll n;
ll a [MAXN], b [MAXN];

int main(){
    cin >> n;
    ll cnt2 = 0;
    for(ll i = 1; i <= n; i++){
        cin >> a[i];
        if(a[i-1] < a[i]) cnt2++;
    }
    ll cnt = 0;
    for(ll i = 1; i <= n; i++){
        cin >> b[i];
        if(b[1] == b[i]) cnt++;
    }
    // if(n <= 10){

    // }
    if(cnt == n){
        ll sblm = 0;
        bool ada = false;
        ll ans = 0;
        a[n+1] = 2*INF;
        for(ll i = 1; i <= n+1; i++){
            if(a[i] == b[1]) ada = true;
            if(a[i] > b[1]){
                if(ada){
                    // cout << i << " " << sblm << endl;
                    ada = false;
                    ans += i-sblm-1;
                }
                sblm = i;
            }
        }
        cout << ans << endl;
        exit(0);
    }
    if(cnt2 == n){
        vector <ll> v;
        for(ll i = 1; i <= n; i++){
            for(ll j = i; j <= n; j++){
                if(a[j] == b[i]){
                    v.push_back(j);
                    break;
                }
            }
        }
        vector <ll> mx;
        for(auto x : v){
            ll tmp = 0;
            for(ll i = 0; i < mx.size(); i++){
                if(v[i] > x) continue;
                tmp = max(tmp, mx[i]);
            }
            mx.push_back(tmp+1);
        }
        ll ans = 0;
        for(auto x : mx){
            ans = max(ans, x);
        }
        cout << ans << endl;
    }
}

Compilation message (stderr)

exam.cpp: In function 'int main()':
exam.cpp:64:29: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   64 |             for(ll i = 0; i < mx.size(); i++){
      |                           ~~^~~~~~~~~~~

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