Submission #946616

#	Time	Username	Problem	Language	Result	Execution time	Memory
946616		n3rm1n	Gap (APIO16_gap)	C++17	42.65 / 100	38 ms	3692 KiB

gap

#include<bits/stdc++.h>
#include "gap.h"

using namespace std;
const long long MAXN = 2e5 + 10;
long long a[MAXN];
long long findGap(int T, int N)
{
    if(T == 1)
    {
        long long s = 0, t = (long long)(1e18);
        long long mn, mx;
        long long n = N;
        long long filled0 = 0, filled1 = n+1;

        while(filled0 + 1 <= filled1 - 1)
        {

            MinMax(s, t, &mn, &mx);

            if(mn == mx)
            {
                filled0 ++;
                a[filled0] = mn;
                n --;
                break;
            }
            filled0 ++;
            filled1 --;
            n-= 2;
            a[filled0] = mn;
            a[filled1] = mx;

            s = mn + 1;
            t = mx - 1;
        }
        long long ans = -1;
        //cout << "n is " << n << endl;
        //cout << a[1] << " ";
        for (long long i = 2; i <= N; ++ i)
        {
            //cout << a[i] << " ";
            ans = max(ans, (long long) (a[i] - a[i-1]));
        }
        //cout << endl;
        //cout << ans << endl;
        return ans;
    }
    long long s = 0, t = (long long)(1e18), mn, mx;
    MinMax(s, t, &mn, &mx);
    long long curr = mn, last = mx;

    long long ans = 1;
    deque < long long > q;
    while(curr < last)
    {
       // cout << curr << endl;
       // cout << "* " << ans << endl;
        s = curr + 1;
        t = curr + ans;
        if(s <= t)
        {
            MinMax(s, t, &mn, &mx);

        if(mn != -1 && mx != -1)
        {
            curr = mx;
            //cout << "move to " << curr << endl;
            continue;
        }
        }
        while(!q.empty() && q.front() <= curr)
        {
            q.pop_front();
        }
        long long  limit = last;
        if(!q.empty())limit = q.front();
        long long lf = ans, rth = min(limit - curr, last - curr), mid, newans = -1;
        //q.clear();
        long long found = 0;
        while(lf <= rth)
        {
            mid = (rth - lf)/2 + lf;
            s = curr + 1;
            t = curr + mid + 1;
            MinMax(s, t, &mn, &mx);
            if(mn == -1 && mx == -1)
            {
                lf = mid + 1;
            }
            else
            {
                rth = mid - 1;
                if(q.empty() || q.front() > mx)q.push_front(mx);
                found = mx;
                newans = mid;
            }
        }

       // cout << "found is " << found << endl;
        if(newans != -1)ans = found - curr;
        else break;
        curr = found;

    }
    return ans;
}

• Subtask 1: 30 / 30
• Subtask 2: 12.6460549623 / 70