Submission #344088

#	Time	Username	Problem	Language	Result	Execution time	Memory
344088		milleniumEeee	Gap (APIO16_gap)	C++17	89.04 / 100	73 ms	2532 KiB

gap

#include "gap.h"
//#include "grader.cpp"
#include <bits/stdc++.h>
#define ll long long
using namespace std;
 
//MinMax(long long s, long long t, long long *mn, long long *mx)
 
const ll INF = (ll)1e18;
const int MAXN = (int)1e5 + 5;
 
ll a[MAXN];
 
long long findGap(int type, int n)
{
  if (n == 2) {
    ll mn, mx;
    MinMax(0, INF, &mn, &mx);
    return mx - mn;
  }
  if (type == 1) {
    ll mn, mx;
    MinMax(0, INF, &mn, &mx);
    int l = 1, r = n;
    a[l] = mn;
    a[r] = mx;
    while (r - l - 1 >= 2) {
      MinMax(mn + 1, mx - 1, &mn, &mx);
      a[++l] = mn;
      a[--r] = mx;
    }
    if (r - l + 1 == 3) {
      MinMax(mn + 1, mx - 1, &mn, &mx);
      a[l + 1] = mn;
    }
    ll ans = 0;
    for (int i = 1; i < n; i++) {
      ans = max(ans, a[i + 1] - a[i]);
    }
    return ans;
  } else {
    ll ans = 0;
    ll mn, mx;
    vector <ll> arr;
    MinMax(0, INF, &mn, &mx);
    ll k = (mx - mn - 1) / (n - 1ll);
    arr.push_back(mn);
    arr.push_back(mx);
    ll MN = mn, MX = mx;
    for (ll pos = MN + 1; pos <= MX - 1; pos += k) {
      ll l = pos;
      ll r = min(MX - 1, pos + k - 1);
      MinMax(l, r, &mn, &mx);
      if (mn != -1 && mx != -1) {
        if (mn == mx) {
          arr.push_back(mn);
        } else {
          arr.push_back(mn);
          arr.push_back(mx);
        }
      }
    }
    sort(arr.begin(), arr.end());
    for (int i = 0; i + 1 < (int)arr.size(); i++) {
      ans = max(ans, arr[i + 1] - arr[i]);
    }
    return ans;
  }
}

• Subtask 1: 30 / 30
• Subtask 2: 59.037623636 / 70