Submission #832123

#	Time	Username	Problem	Language	Result	Execution time	Memory
832123		KaleemRazaSyed	XORanges (eJOI19_xoranges)	C++17	100 / 100	509 ms	7132 KiB

xoranges

#include<iostream>

using namespace std;

const int MAXN = 2e5+5, MAXQ = 1e3;

struct chunk
{
  int a[MAXN], ch[MAXQ];
  void add(int x, int i)
  {
    ch[i/MAXQ] ^= a[i]^x;
    a[i] = x;
  }
  int Xor(int i, int j)
  {
    int ans = 0;
    while(i <= j)
      {
	if(i%MAXQ==0 and MAXQ <= j-i+1)
	  {
	    ans ^= ch[i/MAXQ];
	    i += MAXQ;
	  }
	else
	  ans ^= a[i++];
      }
    return ans;
  }
};

chunk chunks[2];

int main()
{
  int n, q;
  cin >> n >> q;
  for(int i=0;i<n;i++)
    {
      int x;
      cin >> x;
      chunks[i%2].add(x, i/2);
    }
  
  while(q--)
    {
      int t, i, j;
      cin >> t >> i >> j;
      i--;
      if(t==1)
	chunks[i%2].add(j, i/2);
      else
	{
	  if((j-i)&1)
	    cout << chunks[i%2].Xor(i/2, (j-1)/2) << endl;
	  else
	    cout << "0\n";
	}
    }
  
  return 0;
}

• Subtask 1: 12 / 12
• Subtask 2: 18 / 18
• Subtask 3: 25 / 25
• Subtask 4: 20 / 20
• Subtask 5: 25 / 25