Submission #582246

#	Time	Username	Problem	Language	Result	Execution time	Memory
582246		Koosha_mv	The Big Prize (IOI17_prize)	C++14	100 / 100	99 ms	5300 KiB

prize

#include "prize.h"
#include <bits/stdc++.h>
using namespace std;
#define dbgv(v) cout<<#v<<" = "; f(i,0,v.size()) cout<<v[i]<<" "; cout<<endl
#define dbga(a,x,y) cout<<#a<<" = "; f(i,x,y) cout<<a[i]<<" "; cout<<endl
#define erorp(x) cout<<#x<<"={"<<x.F<<" , "<<x.S<<"}"<<endl
#define eror(x) cout<<#x<<'='<<(x)<<endl
#define f_(i,a,b) for(int i=a;i>=b;i--)
#define f(i,a,b) for(int i=a;i<b;i++)
#define nb(x) __builtin_popcount(x)
#define all(v) v.begin(),v.end()
#define bit(n,k) (((n)>>(k))&1)
#define Add(x,y) x=(x+y)%mod
#define maxm(a,b) a=max(a,b)
#define minm(a,b) a=min(a,b)
#define lst(x) x[x.size()-1]
#define sz(x) int(x.size())
#define mp make_pair
#define ll long long
#define pb push_back
#define S second
#define F first

mt19937 rng(time(nullptr));

const int N=2e5+99;

int n,sum,mxc,ans=-1,fen[N];
vector<int> res;

void add(int x){
	for(x++;x<N;x+=(x&-x)){
		fen[x]++;
	}
}
int get(int x){
	int res=0;
	for(x++;x;x-=(x&-x)){
		res+=fen[x];
	}
	return res;
}
void solve(vector<int> vec,int cnt){
	//cout<<"Cnt "<<cnt<<endl;
	//dbgv(vec);
	if(cnt==0) return ;
	int mid;
	while(vec.size()){
		mid=int(vec.size())>>1;
		res=ask(vec[mid]);
		if(res[0]+res[1]==0){
			//cout<<"ans -> "<<vec[mid]<<endl;
			ans=vec[mid];
			add(vec[mid]);
		}
		if(res[0]+res[1]<mxc){
			cnt--;
			add(vec[mid]);
			vec.erase(vec.begin()+mid);
		}
		else{
			break;		
		}
	}
	if(vec.size()==0) return ;
	vector<int> lc,rc;
	int cntl,cntr,res0=res[0];
	f(i,0,mid) lc.pb(vec[i]);
	f(i,mid+1,vec.size()) rc.pb(vec[i]);
	cntl=res0-get(vec[mid]-1);
	cntr=cnt-cntl;
	solve(lc,cntl);
	solve(rc,cntr);

}
int find_best(int _n){
	n=_n;
	srand(time(NULL));
	uniform_int_distribution<int> rnd(0,n-1);
	f(i,0,155){
		int id=(1ll*rand()*rand()+rand())%n;
		res=ask(id);
		maxm(mxc,res[0]+res[1]);
	}
	vector<int> vec(n);
	iota(all(vec),0);
	solve(vec,mxc);
	//eror(ans);
	return ans;
}

Compilation message (stderr)

prize.cpp: In function 'void solve(std::vector<int>, int)':
prize.cpp:9:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 | #define f(i,a,b) for(int i=a;i<b;i++)
......
   69 |  f(i,mid+1,vec.size()) rc.pb(vec[i]);
      |    ~~~~~~~~~~~~~~~~~~          
prize.cpp:69:2: note: in expansion of macro 'f'
   69 |  f(i,mid+1,vec.size()) rc.pb(vec[i]);
      |  ^

• Subtask 1: 20 / 20
• Subtask 2: 80 / 80