Submission #612362

#	Time	Username	Problem	Language	Result	Execution time	Memory
612362		cheissmart	Seesaw (JOI22_seesaw)	C++14	67 / 100	991 ms	1048576 KiB

seesaw

#include <bits/stdc++.h>
#define IO_OP std::ios::sync_with_stdio(0); std::cin.tie(0);
#define F first
#define S second
#define V vector
#define PB push_back
#define EB emplace_back
#define MP make_pair
#define SZ(v) int((v).size())
#define ALL(v) (v).begin(), (v).end()

using namespace std;

typedef long long ll;
typedef pair<int, int> pi;
typedef V<int> vi;
typedef long double db;

string _reset = "\u001b[0m", _yellow = "\u001b[33m", _bold = "\u001b[1m";
void DBG() { cerr << "]" << _reset << endl; }
template<class H, class...T> void DBG(H h, T ...t) {
	cerr << to_string(h);
	if(sizeof ...(t)) cerr << ", ";
	DBG(t...);
}
#ifdef CHEISSMART
#define debug(...) cerr << _yellow << _bold << "Line(" << __LINE__ << ") -> [" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__)
#else
#define debug(...)
#endif

const int INF = 1e9 + 7, N = 2e5 + 6;
const ll oo = 1e18;

int a[N];
ll p[N];

signed main()
{
	IO_OP;

	cout << fixed << setprecision(12);

	int n;
	cin >> n;
	for(int i = 1; i <= n; i++) {
		cin >> a[i];
		p[i] = p[i - 1] + a[i];
	}
	auto go = [&] (int i, int j) {
		return db(p[j] - p[i - 1]) / (j - i + 1);
	};
	V<pair<db, db>> aux;
	for(int len = 1; len <= n; len++) {
		for(int i = 1; i + len - 1 <= n; i++) {
			int j = i + len - 1;
			db he = go(i, j);
			db be = j + 1 <= n ? go(i + 1, j + 1) : oo;
			aux.EB(he, be);
		}
	}
	sort(ALL(aux));
	db tt = go(1, n), ans = oo;
	for(auto[he, be]:aux) {
		ans = min(ans, tt - he);
		tt = max(tt, be);
	}
	cout << ans << '\n';

}

Compilation message (stderr)

seesaw.cpp: In function 'int main()':
seesaw.cpp:64:10: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   64 |  for(auto[he, be]:aux) {
      |          ^

• Subtask 1: 1 / 1
• Subtask 2: 33 / 33
• Subtask 3: 33 / 33
• Subtask 4: 0 / 33