Submission #629545

#	Time	Username	Problem	Language	Result	Execution time	Memory
629545		Elnady	Vudu (COCI15_vudu)	C++17	42 / 140	577 ms	65536 KiB

vudu

#include <bits/stdc++.h>
#include <unordered_map>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace __gnu_pbds;
using namespace std;
#define     endl                '\n'
//#define     long long                 long long
#define     all(pr1)            pr1.begin(),pr1.end()
#define     alr(pr1)            pr1.rbegin(),pr1.rend()
#define     CEIL(pr1, pr2)      (pr1 + pr2 - 1) / pr2
#define     IOS                 std::ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define		RT(s)				return cout<<s,0
#define		sz(s)				(long long)(s.size())

const long long N = 3e5 + 9, M = 1e9 + 9, MOD = 1e9 + 7, OO = 0x3f3f3f3f, MAX = 2147483647, LOO = 0x3f3f3f3f3f3f3f3f;

int32_t main()
{
	IOS;
	long long n, m;
	cin >> n;
	vector<long long> a(n), c;
	vector<pair<long long, long long>> b;
	unordered_map<long long, int> mp;
	for (long long i = 0; i < n; i++)
		cin >> a[i];
	cin >> m;
	a[0] -= m;
	for (long long i = 1; i < n; i++)
	{
		a[i] -= m;
		a[i] += a[i - 1];
	}
	for (long long i = 0; i < n; i++)
		mp[a[i]]++;
	for (auto ch : mp)
		b.push_back({ ch.first, ch.second });
	sort(alr(b));
	for (long long i = 1; i < sz(b); i++)
		b[i].second += b[i - 1].second;
	sort(all(b));
	for (long long i = 0; i < sz(b); i++)
		c.push_back(b[i].first);

	tree <pair<long long, long long>, null_type, less<pair<long long, long long>>, rb_tree_tag, tree_order_statistics_node_update> st;


	long long cur = 0, ans = 0;
	for (long long i = 0; i < n; i++)
	{
		if (c.back() >= cur)
		{
			long long x = (lower_bound(all(c), cur) - c.begin());
			long long y = (i - st.order_of_key({ cur, 0 }));
			ans += (b[x].second - y);
		}
		st.insert({ a[i], i });
		cur = a[i];
	}
	cout << ans << "\n";
}

• Subtask 1: 42 / 140