제출 #252699

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
252699		islingr	Vudu (COCI15_vudu)	C++14	140 / 140	249 ms	15992 KiB

vudu

#include <bits/stdc++.h>

#define rep(i, a, b) for (auto i = (a); i < (b); ++i)

using namespace std;
using ll = int64_t;

const int N = 1 << 20;
ll a[N], t[N];

ll solve(int l, int r) {
	if (r - l == 1) return 0;
	int m = (l + r) / 2;
	ll res = solve(l, m) + solve(m, r);
	int i = l, j = m, k = l;
	while (i < m && j < r)
		if (a[i] <= a[j]) t[k++] = a[i++], res += r - j;
		else t[k++] = a[j++];
	while (i < m) t[k++] = a[i++];
	while (j < r) t[k++] = a[j++];
	rep(i, l, r) a[i] = t[i];
	return res;
}

signed main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

	int n; cin >> n;
	rep(i, 0, n) cin >> a[i + 1];
	int P; cin >> P;
	rep(i, 0, n) a[i + 1] -= P;
	rep(i, 0, n) a[i + 1] += a[i];
	cout << solve(0, n + 1);
}

• Subtask 1: 140 / 140