Submission #883806

#	Time	Username	Problem	Language	Result	Execution time	Memory
883806		phoenix0423	Global Warming (CEOI18_glo)	C++17	100 / 100	49 ms	7380 KiB

glo

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pll;
#define fastio ios::sync_with_stdio(false), cin.tie(0)
#define f first
#define s second
#define pb push_back
#define eb emplace_back
#define int long long 
const int maxn = 1e5 + 5;
const ll INF = 1e18;

signed main(void){
	fastio;
	int n, x;
	cin>>n>>x;
	vector<int> a(n);
	for(int i = 0; i < n; i++) cin>>a[i];
	vector<int> fr(n), bk(n);
	vector<int> len;
	for(int i = 0; i < n; i++){
		int id = lower_bound(len.begin(), len.end(), a[i]) - len.begin();
		if(id == len.size()) len.pb(a[i]);
		else len[id] = a[i];
		fr[i] = id + 1;
	}
	for(int i = 0; i < n; i++) a[i] *= -1;
	len.clear();
	for(int i = n - 1; i >= 0; i--){
		int cur = lower_bound(len.begin(), len.end(), a[i] + x) - len.begin();
		bk[i] = cur + 1;
		int id = lower_bound(len.begin(), len.end(), a[i]) - len.begin();
		if(id == len.size()) len.pb(a[i]);
		else len[id] = a[i];
	}
	int ans = 0;
	for(int i = 0; i < n; i++) ans = max(ans, fr[i] + bk[i] - 1);
	cout<<ans<<"\n";
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:24:9: 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(id == len.size()) len.pb(a[i]);
      |      ~~~^~~~~~~~~~~~~
glo.cpp:34:9: 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]
   34 |   if(id == len.size()) len.pb(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