Submission #1103955

#	Time	Username	Problem	Language	Result	Execution time	Memory
1103955		vjudge1	Global Warming (CEOI18_glo)	C++17	100 / 100	41 ms	4308 KiB

glo

#include <iostream>
#include<vector>
#include<algorithm>
using namespace std;
int arr[200005];
int len[200005];
int mx,idx;
int main() {
    ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
    int n,x; cin >> n >> x;
	for(int i=0;i<n;++i) cin >> arr[i];
	vector<int> dp;
	for(int i=0;i<n;++i){
		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];
		len[i] = idx+1;
		mx=max(mx,len[i]);
	}
    dp.clear();
    for(int i=n-1;i>0;--i){
        idx=lower_bound(dp.begin(),dp.end(),-arr[i]+x)-dp.begin();
        mx=max(mx,len[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 << mx << endl;
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:15:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |         if(idx==dp.size()) dp.push_back(arr[i]);
      |            ~~~^~~~~~~~~~~
glo.cpp:25:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |         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