Submission #844279

#	Time	Username	Problem	Language	Result	Execution time	Memory
844279		amine_aroua	Global Warming (CEOI18_glo)	C++17	0 / 100	36 ms	6992 KiB

glo

#include <bits/stdc++.h>
//#pragma GCC optimize("O3")
//#pragma GCC optimize("unroll-loops")
using namespace std;
#define int long long
#define vi vector<int>
#define vl vector<long long>
#define vii vector<pair<int,int>>
#define vll vector<pair<long long,long long>>
#define pb push_back
#define ll long long
#define ld long double
#define nl '\n'
#define boost ios::sync_with_stdio(false)
#define mp make_pair
#define se second
#define fi first
#define fore(i, y) for(int i = 0; i < y; i++)
#define forr(i,x,y) for(int i = x;i<=y;i++)
#define forn(i,y,x) for(int i = y; i >= x; i--)
#define all(v) v.begin(),v.end()
#define sz(v) (int)v.size()
#define clr(v,k) memset(v,k,sizeof(v))
#define rall(v) v.rbegin() , v.rend()
#define pii pair<int,int>
#define pll pair<ll , ll>

const ll MOD = 1e9 + 7;
const ll INF = 1e18 + 1;

ll gcd(ll a , ll b) {return b ? gcd(b , a % b) : a ;} // greatest common divisor (gcd)
ll lcm(ll a , ll b) {return a * (b / gcd(a , b));} // least common multiple (lcm)

// HERE IS THE SOLUTION
int n  , x;
vi lis(vi &v)
{
    vi dp;
    vi pref(n);
    fore(i , n)
    {
        int cur = v[i];
        int idx = lower_bound(all(dp) , cur) - dp.begin();
        if(idx < sz(dp))
        {
            dp[idx] = cur;
        }
        else
        {
            dp.pb(cur);
        }
        pref[i] = sz(dp);
    }
    return pref;
}
signed main()
{
    boost;
    cin.tie(0);
    cout.tie(0);
    cin>>n>>x;
    vi v(n);
    fore(i , n)
    {
        cin>>v[i];
    }
    vi pref = lis(v);
    reverse(all(v));
    vi suff = lis(v);
    reverse(all(suff));
    reverse(all(v));
    int ans = pref[n - 1];
    fore(i , n - 1)
    {
        ans = max(ans , pref[i] + suff[i +  1]);
    }
    cout<<ans<<nl;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 13
• Subtask 4: 0 / 10
• Subtask 5: 0 / 20
• Subtask 6: 0 / 17
• Subtask 7: 0 / 25