Submission #744320

#	Time	Username	Problem	Language	Result	Execution time	Memory
744320		b00norp	Gap (APIO16_gap)	C++14	100 / 100	60 ms	1900 KiB

gap

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

const long long INF = 1e18;

long long findGap(int T, int N)
{
	if(T == 1)
	{	
		long long mn = 0, mx = INF;
		vector<long long> a(N);
		int l = 0, r = N - 1;
		while(l <= r)
		{
			MinMax(mn, mx, &mn, &mx);
			// cout << "mn = " << mn << ", mx = " << mx << "\n";
			a[l++] = mn;
			a[r--] = mx;
			mn += 1;
			mx -= 1;
		}
		long long diff = 0;
		for(int i = 1; i < N; i++)
		{
			diff = max(diff, a[i] - a[i - 1]);
		}
		return diff;
	}
	long long mn = 0, mx = INF;
	MinMax(mn, mx, &mn, &mx);
	long long min_diff = (mx - mn) / (N - 1) + 1;
	long long ans = 0, prev = -INF;
	for(long long i = mn; i <= mx; i += min_diff)
	{
		long long l, r;
		MinMax(i, i + min_diff - 1, &l, &r);
		if(l == -1)
		{
			continue;
		}
		if(prev == -INF)
		{
			prev = l;
		}
		ans = max(ans, l - prev);
		ans = max(ans, r - l);
		prev = r;
	}
	return ans;
}

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