Submission #228116

#	Time	Username	Problem	Language	Result	Execution time	Memory
228116		eggag32	Gap (APIO16_gap)	C++17	30 / 100	1468 ms	1272 KiB

gap

#pragma GCC optimize ("O3")
#pragma GCC target ("sse4")
#include <bits/stdc++.h>
#include "gap.h"
using namespace std;
typedef long long ll;
typedef long double ld;
typedef vector<int> vi;
typedef pair<int, int> pi;
#define debug(x) cerr << #x << ": " << x << endl;
#define debug2(x, y) debug(x) debug(y);
#define repn(i, a, b) for(int i = (int)(a); i < (int)(b); i++)
#define rep(i, a) for(int i = 0; i < (int)(a); i++)
#define all(v) v.begin(), v.end() 
#define mp make_pair
#define pb push_back
#define lb lower_bound
#define ub upper_bound
#define fi first
#define se second
#define sq(x) ((x) * (x))

template<class T> T gcd(T a, T b){ return ((b == 0) ? a : gcd(b, a % b)); }

ll findGap(int t, int n){
	if(t == 1){
		ll l = 0, r = 1e18;
		ll mn = 0, mx = 0;
		MinMax(l, r, &mn, &mx);
		l = mn, r = mx;
		int cnt = 0;
		if(l != r) cnt = 2;
		else cnt = 1;
		ll ans = 0;
		int f = 1;
		while(cnt < n){
			MinMax(l + 1, r - 1, &mn, &mx);
			ans = max({mn - l, ans, r - mx});
			l = mn, r = mx;
			if(l == r) cnt++;
			else cnt += 2;
		}
		ans = max(ans, r - l);
		return ans;
	}
	else{
		ll low = -1; //our current best
		ll ans = 0;
		ll prev = 0;
		rep(i, n){
			ll l = low + 1, r = 1e18;
			while(l < r){
				ll mid = (l + r) / 2;
				ll mn = 0, mx = 0;
				MinMax(low + 1, mid, &mn, &mx);
				if(mn == -1) l = mid + 1;
				else r = mid;
			}
			if(i) ans = max(ans, l - prev);
			prev = l;
			low = l;
		}
		return ans;
	}
}
/*
Things to look out for:
	- Integer overflows
	- Array bounds
	- Special cases
Be careful!
*/

Compilation message (stderr)

gap.cpp: In function 'll findGap(int, int)':
gap.cpp:35:7: warning: unused variable 'f' [-Wunused-variable]
   int f = 1;
       ^

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