Submission #969695

#	Time	Username	Problem	Language	Result	Execution time	Memory
969695		vjudge1	Global Warming (CEOI18_glo)	C++17	100 / 100	44 ms	3808 KiB

glo

#include<bits/stdc++.h>
using namespace std;
int arr[200007];
int pref[200007];
int main()
{
    cin.tie(nullptr)->ios::sync_with_stdio(0);

    int n,d;
    cin>>n>>d;
    for(int i=0;i<n;i++)cin>>arr[i];

    vector<int> dp;
    int ans=0;
    for(int i=0;i<n;i++)
    {
        int idx=lower_bound(dp.begin(),dp.end(),arr[i])-dp.begin();
        pref[i]=idx+1;
        if(idx==dp.size())dp.push_back(arr[i]);
        else dp[idx]=arr[i]; 
    }
    ans=dp.size();
    dp.clear();
    for(int i=n-1;i>=0;i--)
    {
        int idx=lower_bound(dp.begin(),dp.end(),-arr[i]+d)-dp.begin();
        ans=max(ans,pref[i]+idx);
        idx = lower_bound(dp.begin(),dp.end(),-arr[i])-dp.begin();
        if(idx==dp.size())dp.push_back(-arr[i]);
        else dp[idx]=-arr[i];
    }

    cout<<ans;
    return 0;
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:19:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |         if(idx==dp.size())dp.push_back(arr[i]);
      |            ~~~^~~~~~~~~~~
glo.cpp:29:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |         if(idx==dp.size())dp.push_back(-arr[i]);
      |            ~~~^~~~~~~~~~~

• 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