제출 #508550

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
508550		PoPularPlusPlus	Vudu (COCI15_vudu)	C++17	140 / 140	248 ms	49004 KiB

vudu

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ull unsigned long long 
#define pb(e) push_back(e)
#define sv(a) sort(a.begin(),a.end())
#define sa(a,n) sort(a,a+n)
#define mp(a,b) make_pair(a,b)
#define vf first
#define vs second
#define ar array
#define all(x) x.begin(),x.end()
const int inf = 0x3f3f3f3f;
const int mod = 1000000007; 
const double PI=3.14159265358979323846264338327950288419716939937510582097494459230;
bool remender(ll a , ll b){return a%b;}

struct Fen {
	
	vector<ll> tree;
	
	void init(int n){
		tree.assign(n + 1 , 0LL);
	}
	
	void set(int i , ll val , int n){
		i++;
		while(i <= n){
			tree[i] += val;
			i += (i & (-i));
		}
	}
	
	ll sum(int i){
		i++;
		ll ans = 0;
		while(i > 0){
			ans += tree[i];
			i -= (i & (-i));
		}
		return ans;
	}
	
	void build(vector<int>& a){
		int n = a.size();
		for(int i = 0; i < n; i++){
			set(i , a[i] , n);
		}
	}
	
};

void solve(){
	int n;
	cin >> n;
	ll arr[n];
	for(int i = 0; i < n; i++)cin >> arr[i];
	ll p;
	cin >> p;
	for(int i = 0; i < n; i++)arr[i] -= p;
	ll pre[n + 1];
	pre[n] = 0;
	for(int i = n - 1; i >= 0; i--){
		pre[i] = pre[i + 1] + arr[i];
	}
	vector<pair<ll,int>> v;
	for(int i = 0; i < n + 1; i++){
		v.pb(mp(pre[i] , i));
	}
	sv(v);
	int cur = 1;
	for(int i = 0; i < n + 1; i++){
		for(int j = i; j < n + 1 && v[i].vf == v[j].vf; j++){
			pre[v[j].vs] = cur;
			//cout << v[j].vs << ' ' << cur << '\n';
			i = j;
		}
		cur++;
	}
	ll ans = 0;
	Fen ft;
	ft.init(cur + 5);
	for(int i = 0; i < n; i++){
		ft.set(pre[i] , 1 , cur + 5);
		ll x = pre[i + 1];
		ans += (i + 1LL) - ((ll)ft.sum(x - 1));
	}
	cout << ans << '\n';
}

int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
	//int t;cin >> t;while(t--)
	solve();
	return 0;
}

• Subtask 1: 140 / 140