Submission #396809

#	Time	Username	Problem	Language	Result	Execution time	Memory
396809		abdzag	Global Warming (CEOI18_glo)	C++17	0 / 100	935 ms	61720 KiB

glo

#include<bits/stdc++.h>

#define rep(i,a,b) for(int i=int(a);i<int(b);i++)
#define rrep(i,a,b) for(int i=int(a);i>int(b); i--);
#define all(v) v.begin(),v.end()
#define trav(a,v) for(auto&a:v)

using namespace std;
const long long inf = 1e15;
typedef long long ll;


struct MaxTree {
	typedef ll T;
	static constexpr T unit =0;
	vector<T> s;
	T f(T a, T b) {
		return max(a, b);
	}
	ll n;
	MaxTree(ll n=0) : n(n), s(2*n,unit){}
	void update(ll pos, T val) {
		for (s[pos += n] = val; pos /= 2;) {
			s[pos] = f(s[2 * pos], s[2 * pos + 1]);
		}
	}
	T query(ll l, ll r) {
		T a = unit, b = unit;
		for (l += n, r += n; l < r; l /= 2, r /= 2) {
			if (l % 2)a = f(a, s[l++]);
			if (r % 2) b = f(b, s[--r]);
		}
		return f(a, b);
	}
	T getVal(ll pos) {
		return s[pos + n];
	}
};
int main(){
	cin.sync_with_stdio(false);
	ll n,x;
	cin >> n >> x;
	vector<vector<ll>> before(2 * n + 1);
	vector<ll> v(n);
	rep(i, 0, n) cin >> v[i];
	ll ans = 0;
	rep(i, 0, n)v.push_back(v[i] - x);
	vector<ll> sorted = v;
	sort(all(sorted));
	map<ll,ll> maping;
	rep(i, 0, 2*n)maping[sorted[i]] = i;
	vector<ll> lis(n);
	MaxTree tree(2*n+1);
	vector<ll> v2;
	rep(i, n, 2 * n) v2.push_back(v[i]);
	rep(i, 0, n) {
		lis[i] = 1 + tree.query(0, maping[v2[i]]);
		if (tree.getVal(i)) before[maping[v2[i]]].push_back(tree.getVal(i));
		tree.update(maping[v2[i]],lis[i]);
	}
	MaxTree tree2(2*n+1);
	vector<ll> lis2(n);
	rep(i, 0, n-1) {
		ll curval = 1 + tree2.query(maping[v[n - 1 - i]]+1,2*n+1);
		lis2[i] = curval;
		tree2.update(maping[v[n-1-i]], curval);
		if(before[maping[v2[n - 1 - i]]].empty())tree.update(maping[v2[n - 1 - i]], 0);
		else {
			tree.update(maping[v2[n - 1 - i]], before[maping[v2[n - 1 - i]]].back());
			before[maping[v2[n - 1 - i]]].pop_back();
		}
		ans = max(ans,curval+tree.query(0, maping[v[n - 1 - i]-1]+1));
	}
	cout << ans << endl;
	return 0;
}

Compilation message (stderr)

glo.cpp: In constructor 'MaxTree::MaxTree(ll)':
glo.cpp:20:5: warning: 'MaxTree::n' will be initialized after [-Wreorder]
   20 |  ll n;
      |     ^
glo.cpp:16:12: warning:   'std::vector<long long int> MaxTree::s' [-Wreorder]
   16 |  vector<T> s;
      |            ^
glo.cpp:21:2: warning:   when initialized here [-Wreorder]
   21 |  MaxTree(ll n=0) : n(n), s(2*n,unit){}
      |  ^~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 13
• Subtask 4: 0 / 10
• Subtask 5: 0 / 20
• Subtask 6: 0 / 17
• Subtask 7: 0 / 25