Submission #953222

#	Time	Username	Problem	Language	Result	Execution time	Memory
953222		n3rm1n	Gap (APIO16_gap)	C++17	78.54 / 100	56 ms	3612 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;
        for (long long i = 2; i <= N; ++ i)
            ans = max(ans, (long long) (a[i] - a[i-1]));
        return ans;
    }
    
    
    long long n = N;
    long long s = 0, t = (long long)(1e18);
    long long mn, mx;
    long long range_l = 0, range_r;
    long long l;
    MinMax(s, t, &mn, &mx);
    range_l = mn;
    range_r = mx;
    l = range_r - range_l + 1;
    long long x = (l + n - 1)/n;
    //if(x * (n-1) < l)x ++;
    long long last = range_l, cache = 0;
    long long st = last;
    long long ans = 0;
    while(last < range_r)
    {
 
        s = last + 1;
        t = last + x + 1;
        MinMax(s, t, &mn, &mx);
 
        if(mx != -1 && mn > last && (mn >= s && mn <= t) && (mx >= s && mx <= t))
        {
            ans = max(ans, mn - st);
            last = mx;
            st = last;
        }
        else
        {
            cache += x;
            last = last + x + 1;
        }
    }
    return ans;
}
/**
2 5
2 3 7 17 19
*/

• Subtask 1: 30 / 30
• Subtask 2: 48.5411952864 / 70