Submission #969686

#	Time	Username	Problem	Language	Result	Execution time	Memory
969686		vjudge1	Global Warming (CEOI18_glo)	C++17	0 / 100	27 ms	3092 KiB

glo

#include<bits/stdc++.h>
using namespace std;
int arr[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,pref[200007]={};
    for(int i=0;i<n;i++)
    {
        int idx=upper_bound(dp.begin(),dp.end(),arr[i])-dp.begin();
        if(idx==dp.size())dp.push_back(arr[i]);
        else dp[idx]=arr[i];
        pref[i]=idx-1;
    }
    ans=dp.size();
    dp.clear();
    for(int i=n-1;i>0;i--)
    {
        int idx=upper_bound(dp.begin(),dp.end(),-arr[i]+d)-dp.begin();
        ans=max(ans,pref[idx]+i-1);
        idx = upper_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:17:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |         if(idx==dp.size())dp.push_back(arr[i]);
      |            ~~~^~~~~~~~~~~
glo.cpp:28:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |         if(idx==dp.size())dp.push_back(arr[i]);
      |            ~~~^~~~~~~~~~~

• 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