Submission #302847

#	Time	Username	Problem	Language	Result	Execution time	Memory
302847		arayi	Gap (APIO16_gap)	C++17	100 / 100	60 ms	2804 KiB

gap

#include <bits/stdc++.h>
#include "gap.h"
#define ad push_back
#define lli long long int
using namespace std;
 
int n;
lli l, r;
long long findGap(int T, int N)
{
	n = N;
	lli nl, nr;
	MinMax(0, 1e18, &nl, &nr);
	if(T == 1 || N <= 8)
    {
        vector <lli> a, b;
        a.ad(nl), b.ad(nr);
        for (int i = 0; i < (n - 1) / 2; i++)
        {
            MinMax(nl + 1, nr - 1, &nl, &nr);
            a.ad(nl), b.ad(nr);
        }
        lli mx = 0;
        reverse(b.begin(), b.end());
        for(auto p : b) a.ad(p);
        for (int i = 0; i < a.size() - 1; i++)
            mx = max(mx, a[i + 1] - a[i]);
        return mx;
    }
	lli ans = (nr - nl - 2LL) / (n - 1LL) + 1LL;
	while(nl < nr - ans)
    {
        MinMax(nl + 1, nl + ans + 1LL, &l, &r);
        if(l == -1)
        {
          	ans += 2LL;
            while(l == -1)
            {
                MinMax(nl + 1LL, nl + ans * 2, &l, &r);
                if(l == -1) ans *= 2LL, ans++;
                else ans = max(ans, l - nl), nl = r;
            }
        }
        else ans = max(ans, l - nl), nl = r;
    }
    return ans;
}

Compilation message (stderr)

gap.cpp: In function 'long long int findGap(int, int)':
gap.cpp:26:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |         for (int i = 0; i < a.size() - 1; i++)
      |                         ~~^~~~~~~~~~~~~~

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