Submission #731935

#	Time	Username	Problem	Language	Result	Execution time	Memory
731935		sentheta	Gap (APIO16_gap)	C++17	100 / 100	55 ms	3224 KiB

gap

#include "gap.h"
// author : sentheta aka vanwij
#include<iostream>
#include<iomanip>
#include<algorithm>
#include<cassert>
#include<random>
#include<chrono>
#include<cmath>
#include<string>
#include<vector>
#include<bitset>
#include<queue>
#include<stack>
#include<map>
#include<set>
using namespace std;

#define Int long long
#define V vector
#define pii pair<Int,Int>
#define ff first
#define ss second

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

#define pow2(x) (1LL<<(x))
#define msb(x) (63-__builtin_clzll(x))
#define bitcnt(x) (__builtin_popcountll(x))

#define nl '\n'
#define _ << ' ' <<
#define all(x) (x).begin(), (x).end()
#define rep(i,a,b) for(int i = (int)(a); i < (int)(b); i++)
#define dbg(x) if(1) cout << "?" << #x << " : " << (x) << endl << flush;

pii query(Int l,Int r){
	Int a, b;
	MinMax(l,r, &a,&b);
	return {a,b};
}
Int cdiv(Int a,Int b){
	return (a-1)/b+1;
}

int n;

Int findGap(int T,int _n){
	n = _n;
	if(T==1){
		V<Int> l, r;
		{
			auto[a,b] = query(0,1e18);
			l = {a};
			r = {b};
		}
		while((int)l.size() + (int)r.size() < n){
			auto[a,b] = query(l.back()+1, r.back()-1);
			l.push_back(a);
			r.push_back(b);
		}
		reverse(all(r));
		for(Int x : r) l.push_back(x);

		Int prv = l[0], ans = 0;
		for(Int x : l){
			ans = max(ans, x-prv);
			prv = x;
		}
		return ans;
	}

	auto[a1,an] = query(0,1e18);
	
	Int len = cdiv(an-a1, n-1)+1;
	V<Int> a = {a1};
	for(Int l=a1+1; l<an; l+=len){
		Int r = l+len;
		// Int r = min(an, l+len);
		auto[x,y] = query(l,r);
		
		if(x!=-1){
			a.push_back(x);
			a.push_back(y);
		}
	}
	a.push_back(an);

	Int ans = len-1;
	Int prv = a[0];
	for(Int x : a){
		ans = max(ans, x-prv);
		prv = x;
	}
	assert(ans >= cdiv(an-a1, n-1));
	return ans;
}

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