Submission #844824

#	Time	Username	Problem	Language	Result	Execution time	Memory
844824		dutinmeow	Gap (APIO16_gap)	C++17	100 / 100	41 ms	3848 KiB

gap

#include "gap.h"

#include <bits/stdc++.h>

template<typename T>
bool chmax(T &a, T b) { 
	if (a >= b)
		return false;
	a = b;
	return true;
}

long long findGap(int t, int n) {
	if (t == 1) {
		std::vector<long long> a;
		a.reserve(n);
		long long bl = 0, br = 1e18;
		for (int i = 0; i < (n + 1) / 2; i++) {
			long long al, ar;
			MinMax(bl, br, &al, &ar);
			a.push_back(al);
			a.push_back(ar);
			bl = al + 1, br = ar - 1;
		}
		if ((int)a.size() > n)
			a.pop_back();
		std::sort(a.begin(), a.end());
		long long r = 0;
		for (int i = 1; i < n; i++)
			chmax(r, a[i] - a[i - 1]);
		return r;
	} else {
		long long bl, br;
		MinMax(1, 1e18, &bl, &br);
		long long s = (br - bl - 1) / (n - 1) + 1;
		long long lb, c = bl, r = s;
		for (lb = bl; lb + s < br; lb += s + 1) {
			long long nl, nr;
			MinMax(lb, lb + s, &nl, &nr);
			if (nl != -1 && nr != -1) {
				chmax(r, nl - c);
				c = nr;
			}
		} 
		long long nl, nr;
		MinMax(lb, br, &nl, &nr);
		if (nl != -1 && nr != -1) 
			chmax(r, nl - c);
		return r;
	}
}

• Subtask 1: 30 / 30
• Subtask 2: 70 / 70