Submission #1102622

#	Time	Username	Problem	Language	Result	Execution time	Memory
1102622		coolsentenceidontremember	Hacker (BOI15_hac)	C++17	100 / 100	295 ms	20300 KiB

hac

/*


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*/



#include"bits/stdc++.h"
#define ll long long
#define ld long double
#define ff first
#define ss second
#define pii pair<int, int>
#define mp make_pair
#define make_rng mt19937 rng(chrono::steady_clock::now().time_since_epoch().count())
#define make_rng64 mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count())
using namespace std;

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

const double PI = acos(-1);

struct chash{
	const uint64_t C = uint64_t(2e18 * PI) + 71;
	const uint32_t random = chrono::steady_clock::now().time_since_epoch().count();
	size_t operator()(uint64_t x) const {
		return __builtin_bswap64((x^random)*C);
	}
};




int main(){
	setIO();
	int n;
	cin >> n;
	int k = (n+1)/2;
	vector<int> v(2*n+1);
	for (int i = 1; i <= n; i++){
		cin >> v[i];
		v[i+n] = v[i];
	}
	vector<int> min_range(n+1, INT_MAX);
	for (int i = 1; i <= 2*n; i++) v[i] += v[i-1];
	multiset<int> s;
	for (int i = 1; i <= 2*n; i++){
		if (i + k - 1 <= 2*n) s.insert(v[i+k-1] - v[i-1]);
		if (i > k) s.erase(s.find(v[i-1] - v[i-k-1]));
		int cur = ((i-1)%n) + 1;
		min_range[cur] = min(min_range[cur], *s.begin());
	}
	cout << *max_element(min_range.begin()+1, min_range.end());
}

Compilation message (stderr)

hac.cpp: In function 'void setIO(std::string)':
hac.cpp:139:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  139 |  freopen((s+".in").c_str(), "r", stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
hac.cpp:140:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  140 |  freopen((s+".out").c_str(), "w", stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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