제출 #60056

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
60056		Adhyyan1252	Vudu (COCI15_vudu)	C++11	140 / 140	644 ms	32020 KiB

vudu

#include<bits/stdc++.h>

// 6 47
typedef long long ll;
#define NMAX 1000005
#define SMAX 2300000


using namespace std;

int bit[NMAX];
int n;
void add(int indx){
	for(int i = indx; i <= n; i += (i&-i)){
		bit[i] += 1;
	}
}

ll query(int indx){
	ll ans = 0;
	for(int i = indx; i > 0; i -= (i&-i)){
		ans += bit[i];
	}
	return ans;
}

int main(){
	ios::sync_with_stdio(false); cin.tie(0);
	cin>>n;
	ll a[n];
	for(int i = 0; i < n; i++){
		cin>>a[i];
	}	
	ll p; cin>>p;
	vector<pair<ll, int> > vi;
	ll zero = 0;
	for(int i = n-1; i >= 0; i--){
		a[i] -= p;
		zero -= a[i];
		ll cur = zero + a[i];
		//cout<<i<<" PUSH: "<<cur<<endl;
		vi.push_back({cur, i});
	}
	sort(vi.begin(), vi.end());
	vector<int> indx(n);
	for(int i = 0; i < n; i++){
		indx[vi[i].second] = i;
	}
	ll ans = 0; zero = 0;
	for(int i = n-1; i >= 0; i--){
		add(indx[i]+1);
		zero -= a[i];
		pair<ll, int>  temp = {zero, 0};
		int index = lower_bound(vi.begin(), vi.end(), temp) - vi.begin();
		ans += query(n) - query(index);
	}
	cout<<ans<<endl;
}

• Subtask 1: 140 / 140