Submission #861176

#	Time	Username	Problem	Language	Result	Execution time	Memory
861176		Dec0Dedd	Gap (APIO16_gap)	C++14	42.65 / 100	39 ms	3644 KiB

gap

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

using namespace std;

typedef long long ll;

const ll INF = 1e18;

ll solve1(int n) {
    ll a[n]={};

    ll lf=-1, rf=INF+1, lp=0, rp=n-1;
    while (lp <= rp) {
        ll mn, mx; MinMax(lf+1, rf-1, &mn, &mx);
        if (mn == -1) break;
        a[lp++]=mn, a[rp--]=mx;
        lf=mn, rf=mx;
    }

    ll ans=1;
    for (int i=0; i<n-1; ++i) ans=max(ans, a[i+1]-a[i]);
    return ans;
}

ll solve2(int n) {
    ll lf, rf; MinMax(0, INF, &lf, &rf);

    ll d=1, p=lf, ans=1;
    while (p < rf) {
        ll dcp=d;

        ll mn=-1, mx=-1; 
        while (mn == -1) {
            MinMax(p+1, p+dcp+1, &mn, &mx);
            if (mn == -1) dcp*=2;
        }
        ans=max(ans, mn-p), d=ans;
        p=mx;

        if (rf-p <= d) break;
    } return ans;
}

ll findGap(int t, int n) {
    if (t == 1) return solve1(n);
    return solve2(n);
}

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