Submission #430798

#	Time	Username	Problem	Language	Result	Execution time	Memory
430798		cfalas	Painting Squares (IOI20_squares)	C++14	0 / 100	3414 ms	57000 KiB

squares

#include <bits/stdc++.h>
using namespace std;
#define FORi(i,a,b) for(int i=(int)a;i<(int)b;i++)
#define FOR(i,n) FORi(i,0,n)
#define FOA(v, a) for(auto v : a)
#define ll long long
#define F first
#define S second
typedef pair<int, int> ii;
#include "squares.h"

int ss = 0;
int n;


int bcnt(int x){
	int cnt=0;
	while(x) cnt++, x/=2;
	return cnt;
}

vector<int> ans;
void rec(vector<int> x){
	//cout<<"x "<<x<<endl;
	if((int)x.size()==n){ ans=x; return; }

	// slide da windo
	set<int> all;
	int i=0;
	int c=0;
	int ind=-ss+1;
	while(i<(int)x.size()){
		c = c*2 % (1<<ss);
		//cout<<"( "<<c<<" ";
		if(x[i]) c++;
		//cout<<c<<") ";
		if(ind>=0) all.insert(c);
		ind++;
		i++;
	}
	//cout<<"all ";FOA(v, all) cout<<v<<" ";
	//cout<<endl;

	int next = c*2 % (1<<ss);
	x.push_back(0);
	if(!all.count(next)) rec(x);
	if(ans.size()) return;
	x.back() = 1;
	if(!all.count(next+1)) rec(x);

}

vector<int> paint(int N) {
	n = N;
	ans.clear();
	ss = bcnt(n);
	//cout<<"ss "<<ss<<endl;

	vector<int> t(ss, 0);
	rec(t);
	
	//FOA(v,ans) cout<<v<<" ";
	//cout<<endl;
	ans.push_back(ss);
	return ans;
}

int find_location(int n, std::vector<int> f) {
	ss = bcnt(n);
	//cout<<"finding "<<endl;
	vector<int> t(bcnt(n), 0);
	rec(t);
	//cout<<endl;
	int x =0;
	int ind=0;
	FOA(v,f){
		x*=2;
		x+=v;
		if(v==-1) return n-ind;
		ind++;
	}
	//cout<<"target "<<x<<endl;

	int i=0;
	int c=0;
	ind=-ss+1;
	while(i<(int)ans.size()){
		assert(ind<=n);
		c = c*2 % (1<<ss);
		//cout<<"( "<<c<<" ";
		if(ans[i]) c++;
		//cout<<c<<") ";
		//cout<<ind<<" "<<c<<" "<<x<<endl;
		if(ind>=0 && x==c) return ind;
		ind++;
		i++;
	}
	//cout<<endl;
	return -1;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 15
• Subtask 3: 0 / 20
• Subtask 4: 0 / 55