Submission #76818

#	Time	Username	Problem	Language	Result	Execution time	Memory
76818		vex	Bali Sculptures (APIO15_sculpture)	C++14	0 / 100	3 ms	752 KiB

sculpture

#include <bits/stdc++.h>
#define maxn 2005
using namespace std;

int n,a,b;
long long s[maxn];

bool moze(int x)
{
    int g=0;
    int pr=0;
    long long tr=1LL<<x;
    for(int i=1;i<=n;i++)
    {
        if(s[i]-s[pr]>=tr)
        {
            if(i==pr+1)return false;
            g++;
            pr=i-1;
            i--;
        }
        else if(i==n)g++;
    }
    if(g<=b)return true;
    return false;
}
int numbit()
{
    int l=0;
    int r=50;
    int sol;
    while(l<=r)
    {
        int mid=(l+r)/2;
        if(moze(mid))
        {
            sol=mid;
            r=mid-1;
        }
        else l=mid+1;
    }
    return sol;
}

bool t[maxn][maxn];
bool exist(long long br0,int numb)
{
    long long br=1LL<<numb;
    for(int i=0;i<=n;i++)for(int j=0;j<=n;j++)t[i][j]=false;
    
    t[0][0]=true;
    for(int i=1;i<=n;i++)
        for(int j=0;j<i;j++)
        {
            if(((s[i]-s[j])&br0)==0LL && (s[i]-s[j])<br)
            {
                for(int k=0;k<=n-1;k++)if(t[j][k])t[i][k+1]=true;
            }
        }

    for(int i=a;i<=b;i++)if(t[n][i])return true;
    return false;
}

int dp2[maxn];
bool exist2(long long br0,int numb)
{
	long long br=1LL<<numb;
	for(int i=1;i<=n;i++)dp2[i]=b+1;
	dp2[0]=0;
            for(int i=1;i<=n;i++)
		for(int j=0;j<i;j++)
		{
            		if(((s[i]-s[j])&br0)==0LL && (s[i]-s[j])<br && dp2[j]+1<dp2[i])
            		{
            			 dp2[i]=dp2[j];
            		}
		}
		
	return dp2[n]<=b;
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);

    cin>>n>>a>>b;s[0]=0LL;
    for(int i=1;i<=n;i++)
    {
        int x;
        cin>>x;
        s[i]=s[i-1]+x;
    }

    int br=numbit();
    if(br==0)
    {
    	cout<<0<<endl;
    	return 0;
    }
    
    long long sol=1LL<<(br-1);
    long long obr=0;
    
    if(a==1)
    {
	for(int i=br-2;i>=0;i--)
	{
		obr+=1LL<<i;
		if(!exist2(obr,br))
		{
            		obr-=1LL<<i;
            		sol+=1LL<<i;
		}
	}
	cout<<sol<<endl;
	return 0;
    }
    
    for(int i=br-2;i>=0;i--)
    {
        obr+=1LL<<i;
        if(!exist(obr,br))
        {
            obr-=1LL<<i;
            sol+=1LL<<i;
        }
    }
    cout<<sol<<endl;
    return 0;
}
/*
6 1 3
8 1 2 1 5 4
*/

Compilation message (stderr)

sculpture.cpp: In function 'int numbit()':
sculpture.cpp:42:12: warning: 'sol' may be used uninitialized in this function [-Wmaybe-uninitialized]
     return sol;
            ^~~

• Subtask 1: 0 / 9
• Subtask 2: 0 / 16
• Subtask 3: 0 / 21
• Subtask 4: 0 / 25
• Subtask 5: 0 / 29