Submission #704200

#	Time	Username	Problem	Language	Result	Execution time	Memory
704200		assem_albitar	XOR (IZhO12_xor)	C++14	0 / 100	1 ms	340 KiB

xor

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define mod 1000000007
#define mxe(v)   *max_element(v.begin(), v.end())
#define all(v)   v.begin(), v.end()
#define allr(v) v.rbegin(),v.rend()
#define F first
#define S second
#define pi pair<ll,ll>
#define assem ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define yes cout<<"YES"<<endl;
#define no cout<<"NO"<<endl;
using namespace std;
const int N=400200;
const double PI=3.1415926535897932384626433;
const double eps = 1e-9;
string getString()
{
    char c[(int)2e6];
    //scanf(" %c",&a[i]);
    scanf("%s" , c);
    return c;
    //string x = getString();
}
///printf("%d\n",);
///scanf("%d",&);
///cout.precision(10);
///puts("")string
ll n,k=31,x;
vector<ll> v;
ll id,mx=-1;
struct trie
{
    ll mn;
    trie* child[2];
    trie()
    {
        mn=INT_MAX;
        memset(child,0,sizeof child);
    }
    void add(int i,bitset<32> b,int id)
    {
        if(i==-1)
        {
            mn=id;
            return;
        }
        if(child[b[i]]==0)child[b[i]]=new trie();
        child[b[i]]->add(i-1,b,id);
        if(child[0]!=0)mn=min(mn,child[0]->mn);
        if(child[1]!=0)mn=min(mn,child[1]->mn);
    }
    ll get(int i,bitset<32> b1,bitset<32> b2,ll m)
    {
        if(i==-1)
        {
            m=min(mn,m);
            return m;
        }
        if(!b2[i])
        {
            if(child[!b1[i]]!=0)
            {
                m=min(m,child[!b1[i]]->mn);
            }
            if(child[b1[i]]!=0)return child[b1[i]]->get(i-1,b1,b2,m);
            return m;
        }
        else
        {
            if(child[!b1[i]]!=0)
                return child[!b1[i]]->get(i-1,b1,b2,m);
            return m;
        }
    }
};
int main()
{
    assem
    cin>>n>>x;
    trie* root=new trie();
    bitset<32> b;root->add(k,b,0);
    for(int i=0;i<n;i++)
    {
        ll q;
        cin>>q;
        v.push_back(q);
    }
    ll pre=0;
    bitset<32> bb=x;
    for(int i=0;i<n;i++)
    {
        pre^=v[i];
        b=pre;
        ll c=root->get(k,b,bb,INT_MAX);
        //cout<<c<<endl;
        if(i-c+1>mx)
        {
            mx=i-c+1;
            id=c+1;
        }
        root->add(k,b,i+1);
    }
    cout<<id<<' '<<mx<<endl;
}

Compilation message (stderr)

xor.cpp: In function 'std::string getString()':
xor.cpp:22:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |     scanf("%s" , c);
      |     ~~~~~^~~~~~~~~~

• Subtask 1: 0 / 100