Submission #481752

#	Time	Username	Problem	Language	Result	Execution time	Memory
481752		BackNoob	Global Warming (CEOI18_glo)	C++14	15 / 100	34 ms	3912 KiB

glo

#include <bits/stdc++.h>
#define ll long long
#define fi first
#define se second
#define endl '\n'
#define mask(i) (1LL << (i))
#define ull unsigned long long
#define ld long double
using namespace std;
const int mxN = 3e5 + 227;
const ll inf = 1e9 + 277;
const int mod = 1e9 + 7;
const ll infll = 1e18 + 7;
const int base = 307;
const int LOG = 20;
 
template <typename T1, typename T2> bool minimize(T1 &a, T2 b) {
	if (a > b) {a = b; return true;} return false;
}
template <typename T1, typename T2> bool maximize(T1 &a, T2 b) {
	if (a < b) {a = b; return true;} return false;
}

int n , x; 
int a[mxN];
int l[mxN];
 
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    //freopen("task.inp" , "r" , stdin);
    //freopen("task.out" , "w" , stdout);
    
    cin >> n >> x;
    for(int i = 1 ; i <= n ; i++) cin >> a[i];

    int res = 0;
    vector<int> lis;
	for(int i = 1 ; i <= n ; i++) {
		int pos = lower_bound(lis.begin() , lis.end() , a[i]) - lis.begin();
		l[i] = pos + 1;
		if(pos == (int) lis.size()) lis.push_back(a[i]);
		else lis[pos] = a[i];
		maximize(res , l[i]);
	}
 	
	lis.clear();

	for(int i = n ; i >= 1 ; i--) {
		int pos = lower_bound(lis.begin() , lis.end() , -(a[i] - x)) - lis.begin();
		maximize(res , l[i] + pos);

		pos = lower_bound(lis.begin() , lis.end() , -a[i]) - lis.begin();
		if(pos == (int) lis.size()) lis.push_back(-a[i]);
		else l[pos] = -a[i];
	}

	cout << res;

    return 0;
}

• 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