Submission #708581

#	Time	Username	Problem	Language	Result	Execution time	Memory
708581		yuuhi	Gap (APIO16_gap)	C++14	30 / 100	44 ms	1864 KiB

gap

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

#define f first
#define s second
#define double long double
#define _size(x) ((int)((x).size()))

using namespace std ;

typedef pair< int , int > ii ;

const int maxN = 1e5 + 10 ;

long long a[maxN] ;
int N ;
long long res ;

long long compute (long long lo , long long hi) {
    if (lo > hi) return -1 ;
    if (hi - lo < res) return 0 ;
    long long l , r ;
    MinMax(lo , hi , &l , &r) ;
    if (l == -1) return -1 ;
    lo = l + 1 ; hi = r - 1 ;
    if (lo > hi) {
        res = max(res , r - l) ;
        return r - l ;
    }

    long long mid = (lo + hi) >> 1 ;
    long long L = compute(lo , mid) ;
    long long R = compute(mid + 1 , hi) ;
    if (L == -1 && R == -1) {
        res = max(res , r - l) ;
        return r - l ;
    }
    return max(L , R) ;
}

long long findGap (int T , int n) {
    N = n ;
    if (T == 1) {
        long long l = 0 , r = 1e18 ;
        for (int i = 1 ; i <= (n + 1) / 2 ; ++ i) {
            MinMax(l , r , &a[i] , &a[n - i + 1]) ;
            l = a[i] + 1 ; r = a[n - i + 1] - 1 ;
        }
        long long ans = 0 ;
        for (int i = 1 ; i < n ; ++ i) ans = max(ans , a[i + 1] - a[i]) ;
        return ans ;
    }
    else {
        return compute(0 , 1e18) ;
    }
}

• Subtask 1: 30 / 30
• Subtask 2: 0 / 70