Submission #867041

#	Time	Username	Problem	Language	Result	Execution time	Memory
867041		boris_7	Global Warming (CEOI18_glo)	C++17	100 / 100	48 ms	5524 KiB

glo

#include<bits/stdc++.h>

using namespace std;
using ll = long long;

void solve(){
    int n,k;
    cin>>n>>k;
    vector<int>v(n);
    for(int i = 0;i<n;i++){
        cin>>v[i];
    }
    vector<int>dp(n+1,1e9);
    vector<int>pref(n);
    int ans = 0;
    for(int i = 0;i<n;i++){
        auto it = lower_bound(dp.begin(),dp.end(),v[i])-dp.begin();
        dp[it]=v[i];
        pref[i]=it+1;
        ans = max(ans,pref[i]);
    }
    dp = vector<int>(n+1,1e9);
    for(int i = n-1;i>=0;i--){
		auto it = lower_bound(dp.begin(), dp.end(), -v[i] + k) - dp.begin();
        ans = max(ans,int(it+pref[i]));
        it = lower_bound(dp.begin(),dp.end(),-v[i])-dp.begin();
        dp[it]=-v[i];
    }
    cout<<ans<<endl;
}

signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(nullptr);
    // int t;cin>>t;while(t--)
        solve();
}

• 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