제출 #380387

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
380387		ritul_kr_singh	Vudu (COCI15_vudu)	C++17	140 / 140	613 ms	46572 KiB

vudu

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define sp << ' ' <<
#define nl << '\n'

struct segtree{
	int sz = 1;
	vector<int> a;
	segtree(int n){
		while(sz < n) sz *= 2;
		a.assign(2*sz, 0);
	}
	void update(int i, int x, int lx, int rx){
		if(rx-lx==1) return void(++a[x]);
		int mx = (lx+rx)/2;
		if(i<mx) update(i, 2*x+1, lx, mx);
		else update(i, 2*x+2, mx, rx);
		++a[x];
	}
	int get(int r, int x, int lx, int rx){
		if(lx>=r) return 0;
		if(rx<=r) return a[x];
		int mx = (lx+rx)/2;
		return get(r, 2*x+1, lx, mx) + get(r, 2*x+2, mx, rx);
	}
	int get(int r){
		update(r, 0, 0, sz);
		return get(r+1, 0, 0, sz)-1;
	}
};
 
signed main(){
	ios_base::sync_with_stdio(false); cin.tie(nullptr);
	int n, p; cin >> n;
	pair<int, int> pre[n+1] = {{0, 0}};
	for(int i=1; i<=n; ++i){
		pre[i].second = i;
		cin >> pre[i].first;
		pre[i].first += pre[i-1].first;
	}
	cin >> p;
	for(int i=1; i<=n; ++i) pre[i].first -= i*p;
	sort(pre, pre+n+1);

	int rank[n+1]={0}, curr = 0;
	for(int i=1; i<=n; ++i){
		curr += pre[i].first != pre[i-1].first;
		rank[pre[i].second] = curr;
	}
	++curr;

	segtree st(curr);
	int ans = 0;

	for(int i=0; i<=n; ++i) ans += st.get(rank[i]);

	cout << ans;
}

• Subtask 1: 140 / 140