Submission #595432

#	Time	Username	Problem	Language	Result	Execution time	Memory
595432		bLIC	Global Warming (CEOI18_glo)	C++17	100 / 100	57 ms	5412 KiB

glo

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

#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define sz(x) (int)(x).size()
#define ft first
#define sd second
#define pb push_back
#define endl '\n'

typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<pii> vii;
typedef vector<ll> vl;
typedef pair<ll, ll> pll;
typedef vector<pll> vll;
typedef vector<vi> vvi;

#define dbg if(1)

void printbit(int x) {string s="\n";while(x){s+=((x%2)?'1':'0');x/=2;} reverse(all(s)); cout<<s;}

const ll MOD = 1e9+7;
const int INF = 1e9;
const int N = 2501;

void solve(){
    int n, k;
    cin>>n>>k;
    vi a(n);
    for (int i =0;i<n;i++) cin>>a[i];

    vector<int> s(n+1, INF);
    vii pref(n+1, {0,INF}); 
    int ans = 0;
    for (int i = 0;i<n;i++){
        int pos = lower_bound(all(s), a[i])-s.begin();
    
        s[pos] = a[i];
        pref[i] = {pos+1, a[i]};
        ans = max(ans, pos+1);
    }

    for (int i = 0; i < n; i++) a[i]*=-1;
    s.clear();
    s.resize(n+1, INF);
    for (int i = n-1;i>=0;i--){
        int pos = lower_bound(all(s), a[i]+k)-s.begin();
        ans = max(ans, pref[i].ft+pos);

        pos = lower_bound(all(s), a[i])-s.begin();
        s[pos] = a[i];
    }

    cout<<ans;
}


int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);


// #ifdef ONLINE_JUDGE
// freopen("timeline.in", "r", stdin);
// freopen("timeline.out", "w", stdout);
// #endif


    int t = 1;
//    cin>>t;
    int i = 0;

    while(t--){
        // cout<<"Case #"<<++i<<": ";
        solve();
        cout<<"\n";
    }
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:75:9: warning: unused variable 'i' [-Wunused-variable]
   75 |     int i = 0;
      |         ^

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