Submission #463701

#	Time	Username	Problem	Language	Result	Execution time	Memory
463701		Hamed5001	Art Exhibition (JOI18_art)	C++14	0 / 100	0 ms	204 KiB

art

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

unordered_map<ll, ll> ID;
const int mxN = 1e6+100;
ll BIT[mxN], N, P, id = 1;

void add(int idx, ll delta) {
	for (; idx < id; idx += idx & -idx)
		BIT[idx] += delta;
}

ll query(int idx) {
	ll ret = 0;
	for (; idx > 0; idx -= idx & -idx)
		ret += BIT[idx];
	return ret;
}

void solve() {
	cin >> N;
	vector<ll> A(N); 
	for (auto& a : A) scanf("%lld", &a);
	cin >> P;
	for (auto& a : A) a-=P;


	vector<ll> AA;

	ll sum = 0;
	AA.push_back(sum);
	for (auto& a : A) {
		sum += a;
		AA.push_back(sum);
	}

	sort(AA.rbegin(), AA.rend());

	for (int i = 0; i < AA.size(); ++i) {
		if (!ID[AA[i]])
			ID[AA[i]] = id++;
	}

	for (auto& aa : AA) {
		add(ID[aa], 1);
	}
	add(ID[0], -1);


	sum = 0;
	ll ans = 0;
	for (auto a : A) {
		ans += query(ID[sum]);
		sum += a;
		add(ID[sum], -1);
	}

	printf("%lld", ans);
}

int main() {

	solve();
}

Compilation message (stderr)

art.cpp: In function 'void solve()':
art.cpp:41:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |  for (int i = 0; i < AA.size(); ++i) {
      |                  ~~^~~~~~~~~~~
art.cpp:25:25: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |  for (auto& a : A) scanf("%lld", &a);
      |                    ~~~~~^~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 50