Submission #203981

#	Time	Username	Problem	Language	Result	Execution time	Memory
203981		Segtree	Gap (APIO16_gap)	C++14	100 / 100	85 ms	3244 KiB

gap

#include<iostream>
#include<algorithm>
#include<vector>
#include"gap.h"
using namespace std;
typedef long long ll;
#define chmin(a,b) a=min(a,b)
#define chmax(a,b) a=max(a,b)
#define rep(i,n) for(int i=0;i<n;i++)
#define mod 1000000007
#define mad(a,b) a=(a+b)%mod
/*
ll a[100010],n,m;
void MinMax(ll s,ll t,ll &mn,ll &mx){
	m++;
	ll l,r,mid;
	l=-1,r=n;
	while(l<r-1){
		mid=(l+r)>>1;
		if(a[mid]>=s)r=mid;
		else l=mid;
	}
	mn=a[r];
	l=-1,r=n;
	while(l<r-1){
		mid=(l+r)>>1;
		if(a[mid]<=t)l=mid;
		else r=mid;
	}
	mx=a[l];
}*/

ll findGap(int T,int N){
	if(T==1){
		ll A[100010];
		A[0]=-1,A[N+1]=2e18;
		ll l=0,r=N+1;
		while(l+1<=r-1){
			ll mn,mx;
			MinMax(A[l]+1,A[r]-1,&mn,&mx);
			l++,r--;
			A[l]=mn,A[r]=mx;
		}
		ll ans=0;
		for(int i=1;i<=N-1;i++)ans=max(ans,A[i+1]-A[i]);
		return ans;
	}
	ll mn,mx;
	ll a,b;
	MinMax(0,1e18,&a,&b);
	ll lower=(b-a+N-1-1)/(N-1);
	vector<ll> v;
	v.push_back(a);
	v.push_back(b);
	for(int i=0;i<N;i++){
		MinMax(a+i*lower+1,a+(i+1)*lower,&mn,&mx);
		if(mn>=0)v.push_back(mn);
		if(mx>=0)v.push_back(mx);
	}
	sort(v.begin(),v.end());
	v.erase(unique(v.begin(),v.end()),v.end());
	ll ans=0;
	rep(i,v.size()-1)ans=max(ans,v[i+1]-v[i]);
	return ans;
}
/*
int main(){
	n=100000;
	rep(i,n)a[i]=rand()%mod;
	sort(a,a+n);
	ll ans=0;
	rep(i,n-1)chmax(ans,a[i+1]-a[i]);
	m=0;
	cout<<ans<<endl;
	cout<<findGap(0,n)<<endl;
	cout<<"m="<<m<<endl;
}*/

Compilation message (stderr)

gap.cpp: In function 'll findGap(int, int)':
gap.cpp:9:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 #define rep(i,n) for(int i=0;i<n;i++)
gap.cpp:63:6:
  rep(i,v.size()-1)ans=max(ans,v[i+1]-v[i]);
      ~~~~~~~~~~~~              
gap.cpp:63:2: note: in expansion of macro 'rep'
  rep(i,v.size()-1)ans=max(ans,v[i+1]-v[i]);
  ^~~

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