Submission #1019090

#	Time	Username	Problem	Language	Result	Execution time	Memory
1019090		ivaziva	Global Warming (CEOI18_glo)	C++14	15 / 100	65 ms	7048 KiB

glo

#include <bits/stdc++.h>

using namespace std;

#define MAXN 200010

long long n,x;
long long a[MAXN],b[MAXN];
long long lis1[MAXN],lis2[MAXN];
vector<long long> dp;

int main()
{
    cin>>n>>x;
    for (long long i=1;i<=n;i++) cin>>a[i];
    for (long long i=1;i<=n;i++)
    {
        long long pos=lower_bound(dp.begin(),dp.end(),a[i])-dp.begin();lis1[i]=pos+1;
        if (pos==dp.size()) dp.push_back(a[i]);
        else dp[pos]=a[i];
    }
    dp.clear();
    for (long long i=n;i>=1;i--)
    {
        long long pos1=lower_bound(dp.begin(),dp.end(),x-a[i])-dp.begin();lis2[i]=pos1+1;
        long long pos2=lower_bound(dp.begin(),dp.end(),a[i]*(-1))-dp.begin();
        if (pos2==dp.size()) dp.push_back(a[i]*(-1));
        else dp[pos2]=a[i];
    }
    long long ans=lis1[n];
    for (long long i=1;i<n;i++)
    {
        long long lis=lis1[i]+lis2[i]-1;
        ans=max(ans,lis);
    }
    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 (pos==dp.size()) dp.push_back(a[i]);
      |             ~~~^~~~~~~~~~~
glo.cpp:27:17: 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]
   27 |         if (pos2==dp.size()) dp.push_back(a[i]*(-1));
      |             ~~~~^~~~~~~~~~~

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