Submission #497710

#	Time	Username	Problem	Language	Result	Execution time	Memory
497710		Codurr	Hacker (BOI15_hac)	C++14	100 / 100	303 ms	22204 KiB

hac

#include "bits/stdc++.h"
using namespace std;

#define int long long //Avoid if time complexity very close to limit
#define ll long long
#define sz(x) (int)((x).size())
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
#define f first
#define s second

void setIO(string s = "") {
	ios_base::sync_with_stdio(0); cin.tie(0);
	if (sz(s)) {
		freopen((s + ".in").c_str(), "r", stdin);
		freopen((s + ".out").c_str(), "w", stdout);
	}
}

//Imp consts
const int MOD = 1e9 + 7;
const int MAXN = 2e5 + 1;
const int INF = 1e18 + 5;
const double pi = 3.14159265358979323846;
const double ep = 1e-20;

signed main() {
	setIO();
	int n, sum = 0;
	cin >> n;
	int x = (n + 1) / 2;
	vector<int> v(2 * n + 1);
	for (int i = 1; i <= n; i++)
		cin >> v[i];
	for (int i = 1; i <= n; i++)
		v[n + i] = v[i];
	for (int i = 1; i <= 2 * n; i++)
		v[i] += v[i - 1];
	multiset<int> s;
	int ans = -INF;
	for (int i = 1; i < n + x; i++) {
		s.insert(v[i + x - 1] - v[i - 1]);
		if (i >= x) {
			ans = max(ans, *s.begin());
			s.erase(s.find(v[i] - v[i - x]));
		}
	}
	cout << ans;
	return 0;
}

Compilation message (stderr)

hac.cpp: In function 'int main()':
hac.cpp:29:9: warning: unused variable 'sum' [-Wunused-variable]
   29 |  int n, sum = 0;
      |         ^~~
hac.cpp: In function 'void setIO(std::string)':
hac.cpp:15:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |   freopen((s + ".in").c_str(), "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
hac.cpp:16:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |   freopen((s + ".out").c_str(), "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 40 / 40