oj.uz

답안 #924106

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
924106 2024-02-08T13:10:27 Z TIN Vudu (COCI15_vudu) C++17
112 / 140
 469 ms 65536 KB 
#include <bits/stdc++.h>

using namespace std;

#define FNAME "test"

#define sz(v) (int) (v).size()
#define all(v) (v).begin(), (v).end()

typedef long long ll;

const int N = 1e6 + 5;

int n;
ll a[N];
ll P;
ll sum;
vector<ll> pre;
ll ans = 0;

struct Fenwick {
	int n;
	vector<ll> f;

	Fenwick(int n) : n(n), f(n + 1, 0) {}

	void set(ll i) {
		for (; i <= n; i += i & (-i)) f[i]++;
	}

	ll get(ll i) const {
		ll r = 0;
		for (; i >= 1; i -= i &(-i)) r += f[i];
		return r;
	}
};

void Task() {
	ios_base::sync_with_stdio(false);
	cin.tie(0); cout.tie(0);
	cout << fixed << setprecision(9);
	if (fopen(FNAME".inp","r")) {
		freopen(FNAME".inp","r",stdin);
		freopen(FNAME".out","w",stdout);
	}
}

void compress(vector<ll>& a) {
	set<ll> s(a.begin(), a.end());
	vector<ll> b(s.begin(), s.end());
	for (ll &x : a) x = lower_bound(b.begin(), b.end(), x) - b.begin() + 1;
}

void Solve() {
	//Your Code
	cin >> n;
	for (int i = 1; i <= n; i++) cin >> a[i];
	cin >> P;
	sum = 0;
	pre.clear();
	pre.push_back(sum);
	for (int i = 1; i <= n; i++) {
		sum += a[i] - P;
		pre.push_back(sum);
	}
	compress(pre);
	Fenwick BIT(sz(pre) + 1);
	for (int i = 1; i <= n; i++) {
		BIT.set(pre[i - 1]);
		ans += BIT.get(pre[i]);
	}
	cout << ans << '\n';
}

int main() {
	Task();
	Solve();
	cerr << "\nTime run: " << 1000*clock()/CLOCKS_PER_SEC << "ms";
	return 37^37;
}

Compilation message

vudu.cpp: In function 'void Task()':
vudu.cpp:43:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |   freopen(FNAME".inp","r",stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
vudu.cpp:44:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   44 |   freopen(FNAME".out","w",stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
112.0 / 140.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 856 KB Output is correct
2 Correct 2 ms 604 KB Output is correct
3 Correct 2 ms 604 KB Output is correct
4 Runtime error 368 ms 65536 KB Execution killed with signal 9
5 Correct 272 ms 41596 KB Output is correct
6 Correct 469 ms 64584 KB Output is correct
7 Correct 468 ms 65536 KB Output is correct
8 Correct 405 ms 56280 KB Output is correct
9 Runtime error 321 ms 65536 KB Execution killed with signal 9
10 Correct 443 ms 65536 KB Output is correct