Submission #934951

#	Time	Username	Problem	Language	Result	Execution time	Memory
934951		tamir1	Global Warming (CEOI18_glo)	C++14	100 / 100	42 ms	6420 KiB

glo

#include<bits/stdc++.h>
#define ll long long
#define all(v) (v).begin(),(v).end()
using namespace std;
ll i,j,n,x,a[200005],b[200005],ans;
vector<ll> v;
int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	cin >> n >> x;
	for(i=1;i<=n;i++){
		cin >> a[i];
		j=lower_bound(all(v),a[i]+x)-v.begin();
		b[i]=j+1;
		j=lower_bound(all(v),a[i])-v.begin();
		if(j==v.size()) v.push_back(a[i]);
		else v[j]=a[i];
	}
	v.clear();
	for(i=n;i>=1;i--){
		j=lower_bound(all(v),-a[i])-v.begin();
		ans=max(ans,b[i]+j);
		if(j==v.size()) v.push_back(-a[i]);
		else v[j]=-a[i];
	}
	cout << ans;
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:17:7: 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]
   17 |   if(j==v.size()) v.push_back(a[i]);
      |      ~^~~~~~~~~~
glo.cpp:24:7: 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]
   24 |   if(j==v.size()) v.push_back(-a[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