| # | Time | Username | Problem | Language | Result | Execution time | Memory |
|---|---|---|---|---|---|---|---|
| 340860 | super_j6 | Gap (APIO16_gap) | C++14 | 0 ms | 0 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
//#include "gap.h"
#include <iostream>
#include <cstdio>
#include <algorithm>
using namespace std;
#define endl '\n'
#define ll long long
#define pi pair<int, int>
#define f first
#define s second
const int mxn = 100000;
int t, n;
ll a[mxn];
void MinMax(ll l, ll r, ll *x, ll *y){
l = lower_bound(a, a + n, l) - a;
r = upper_bound(a, a + n, r) - a - 1;
if(l > r) *x = -1, *y = -1;
else *x = a[l], *y = a[r];
}
void f(ll l, ll r, ll &x, ll &y){
MinMax(l, r, &x, &y);
}
ll findGap(int t, int n){
ll l, r, ret = 0;
f(0, 1e18, l, r);
if(n == 2) return r - l;
for(ll i = l + 1, d = 2 * (r - l - 1) / (n - 2); i + d - 1 < r; i += d){
ll x, y;
f(i, i + d - 1, x, y);
if(~x && ~y) ret = max({ret, x - l, y - x}), l = y;
}
ret = max(ret, r - l);
return ret;
}
int main(){
ios::sync_with_stdio(0);
cin.tie(0);
cin >> t >> n;
for(int i = 0; i < n; i++) cin >> a[i];
cout << findGap(t, n) << endl;
return 0;
}