Submission #567024

#	Time	Username	Problem	Language	Result	Execution time	Memory
567024		guagua0407	Global Warming (CEOI18_glo)	C++17	100 / 100	70 ms	5012 KiB

glo

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define f first
#define s second
#define _ ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

int main() {_
	int n,x;
	cin>>n>>x;
	vector<int> num(n);
	for(auto &u:num){
		cin>>u;
	}
	int l[n],r[n];
	int ans=0;
	vector<int> lis;
	for(int i=0;i<n;i++){
		int pos=lower_bound(lis.begin(),lis.end(),num[i])-lis.begin();
		l[i]=pos+1;
		pos=lower_bound(lis.begin(),lis.end(),num[i]-x)-lis.begin();
		if(pos==lis.size()){
			lis.push_back(num[i]-x);
		}
		else{
			lis[pos]=num[i]-x;
		}
	}
	lis.clear();
	for(int i=n-1;i>=0;i--){
		int pos=lower_bound(lis.begin(),lis.end(),num[i],greater<int>())-lis.begin();
		if(pos==lis.size()){
			lis.push_back(num[i]);
			r[i]=lis.size();
		}
		else{
			lis[pos]=num[i];
			r[i]=pos+1;
		}
		
	}
	for(int i=0;i<n;i++){
		//cout<<l[i]<<' '<<r[i]<<'\n';
		ans=max(ans,l[i]+r[i]-1);
	}
	cout<<ans;
	
	return 0;
}
//maybe its multiset not set

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:22:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |   if(pos==lis.size()){
      |      ~~~^~~~~~~~~~~~
glo.cpp:32:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |   if(pos==lis.size()){
      |      ~~~^~~~~~~~~~~~

• 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