Submission #167942

#	Time	Username	Problem	Language	Result	Execution time	Memory
167942		Thuleanx	Untitled (POI11_rot)	C++14	36 / 100	1086 ms	37208 KiB

Main

#include <bits/stdc++.h>
using namespace std;

int n;

struct BIT {
	unordered_map<int,int> tree;
	vector<int> elems;
	BIT() {}
	void add(int v) {
		elems.push_back(v);
		for (; v < n; v|=v+1)
			tree[v]++;
	}
	int sum(int v) {
		int ans = 0;
		for (; v >= 0; v = (v&(v+1))-1)
			if (tree.count(v))
				ans += tree[v];
		return ans;
	}
	int merge(BIT &other) {
		int ans = 0;
		for (int x : other.elems)
			ans += sum(x);
		for (int x : other.elems)
			add(x);
		return ans;
	}
};

int merge(BIT &a, BIT &b) {
	if (a.elems.size() < b.elems.size())
		swap(a,b);
	int y = a.elems.size() * b.elems.size();
	int x = a.merge(b);
	return min(x, y-x);
}

BIT solve(int &ans) {
	int x; cin>>x;
	if (x) {
		BIT ds;		
		ds.add(x-1);
		return ds;
	} else {
		BIT a = solve(ans), b = solve(ans);
		ans += merge(a,b);
		return a.elems.size()>b.elems.size() ? a : b;
	}
}


int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);

	cin >> n;
	int ans = 0;
	solve(ans);
	cout << ans << endl;

	return 0;
}

• Subtask 1: 9 / 9
• Subtask 2: 9 / 9
• Subtask 3: 9 / 9
• Subtask 4: 9 / 9
• Subtask 5: 0 / 9
• Subtask 6: 0 / 9
• Subtask 7: 0 / 9
• Subtask 8: 0 / 9
• Subtask 9: 0 / 9
• Subtask 10: 0 / 9
• Subtask 11: 0 / 10