Submission #594697

#	Time	Username	Problem	Language	Result	Execution time	Memory
594697		bLIC	Global Warming (CEOI18_glo)	C++17	62 / 100	71 ms	7988 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;
    int a[n];
    for (int i =0;i<n;i++) cin>>a[i];

    set<int> s;
    vii pref(n+1, {0,-INF}); 
    for (int i = 0;i<n;i++){
        auto it = s.lower_bound(a[i]);
        if (it!=s.end()) s.erase(it);
        s.insert(a[i]);
        pref[i+1] = {sz(s), *--s.end()};
    }

    for (int i =0 ;i<n;i++) a[i]*=-1;
    vi temp;
    int ans = pref[n-1].ft;
    for (int i = n-1;i>=0;i--){
        auto it = lower_bound(all(temp), a[i]);
        if (it!=temp.end()) *it = a[i];
        else temp.pb(a[i]);
        int inc = lower_bound(all(temp), -pref[i].sd+k)-temp.begin();

        ans = max(ans, pref[i].ft+inc);
    }

    // for (int i = 0;i<=n;i++) {
    //     if (pref[i].ft+suff[i].ft>ans && pref[i].sd-k<suff[i].sd){
    //         ans = pref[i].ft+suff[i].ft;
    //     }
    // }
    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:79:9: warning: unused variable 'i' [-Wunused-variable]
   79 |     int i = 0;
      |         ^

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