Submission #1019187

#	Time	Username	Problem	Language	Result	Execution time	Memory
1019187		ivaziva	Global Warming (CEOI18_glo)	C++14	100 / 100	111 ms	6604 KiB

glo

#include <bits/stdc++.h>

using namespace std;

#define MAXN 200010

long long n,x;
long long a[MAXN],lis[MAXN];
vector<long long> dp;

int main()
{
    cin>>n>>x;
    for (long long i=1;i<=n;i++) cin>>a[i];
    long long ans=0;
    for (long long i=1;i<=n;i++)
    {
        long long poz=lower_bound(dp.begin(),dp.end(),a[i])-dp.begin();
        if (poz==dp.size()) dp.push_back(a[i]);
        else dp[poz]=a[i];
        lis[i]=poz+1;ans=max(ans,lis[i]);
    }
    dp.clear();
    for (long long i=n;i>=1;i--)
    {
        long long poz1=lower_bound(dp.begin(),dp.end(),x-a[i])-dp.begin();
        ans=max(ans,poz1+lis[i]);
        long long poz2=lower_bound(dp.begin(),dp.end(),a[i]*(-1))-dp.begin();
        if (poz2==dp.size()) dp.push_back(a[i]*(-1));
        else dp[poz2]=a[i]*(-1);
    }
    cout<<ans<<endl;
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:19:16: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |         if (poz==dp.size()) dp.push_back(a[i]);
      |             ~~~^~~~~~~~~~~
glo.cpp:29:17: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |         if (poz2==dp.size()) dp.push_back(a[i]*(-1));
      |             ~~~~^~~~~~~~~~~

• 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