Submission #21872

#	Time	Username	Problem	Language	Result	Execution time	Memory
21872		petrpan	Sequence (BOI14_sequence)	C++14	100 / 100	263 ms	3004 KiB

sequence

#include <iostream>
#include <vector>

using namespace std;

typedef vector<int> vii;

long long n;

long long back_track(vii a,int al=0)
{
	long long m=2e18;
	if (a.size()==1)
	{
		if (!a[0]) return 0;
		long long x=0;
		for (int i=1;i<=9;i++)
		{
			if (a[0]&(1<<i)) x*=10,x+=i;
			if (x and a[0]&1) x*=10,a[0]^=1;  
		}
		if (!x) x=1;
		if (a[0]&1) x*=10;
		return x;	
	}
	for (int i=0;i<=9-al;i++)
	{
		vii b(1,0);
		int cur=i,z=0;
		for (int j=0;j<a.size();j++)
		{
			if (cur==10) b.push_back(0),cur=0;
			int tp=a[j];
			if (a[j]&1 and cur==0) z=1;
			if (tp&(1<<cur)) tp^=1<<cur;
			b.back()|=tp;
			cur++;
		}
		long long tp=back_track(b,(a.size()<=2 and i==9))*10+i;
		if (!tp and z) tp=10; 
		m=min(m,tp);
	}	
	return m;
}

int main()
{
	//freopen("input.txt","r",stdin);
	cin >> n;
	vii x(0);
	for (int i=1;i<=n;i++)
	{
		int d;
		cin >> d;
		x.push_back(1<<d);
	}
	cout << back_track(x);
}

Compilation message (stderr)

sequence.cpp: In function 'long long int back_track(vii, int)':
sequence.cpp:30:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int j=0;j<a.size();j++)
                 ^

• Subtask 1: 9 / 9
• Subtask 2: 33 / 33
• Subtask 3: 25 / 25
• Subtask 4: 33 / 33