oj.uz

Submission #564826

# Submission time Handle Problem Language Result Execution time Memory
564826 2022-05-19T18:27:00 Z mircea_007 XORanges (eJOI19_xoranges) C++17
100 / 100
 66 ms 7840 KB 
// This program was written on 19.05.2022
// for problem xoranges
// by Mircea Rebengiuc

#include <stdio.h>
#include <ctype.h>

#define MAXN 200000
#define MAX_HALF 100000

class AIB {
  private:
    int aib[1 + MAX_HALF];
    int n;
  
  public:
    AIB(){}
    
    void resize( int _n ){ n = _n; }
    
    int query( int l, int r ){
      int retval = 0;

      r++;
      
      while( r ){
        retval ^= aib[r];
        r &= (r - 1);
      }

      while( l ){
        retval ^= aib[l];
        l &= (l - 1);
      }
      
      return retval;
    }
    
    void update( int i, int delta ){
      i++;
      
      while( i <= n ){
        aib[i] ^= delta;
        i += (-i & i);
      }
    }
} aib[2];

int v[MAXN];

inline int query( int l, int r ){
  if( (l - r) & 1 )
    return 0;
  
  return aib[l & 1].query( l >> 1, r >> 1 );
}

inline void update( int i, int newval ){
  aib[i & 1].update( i >> 1, newval ^ v[i] );
  v[i] = newval;
}

static inline int getint(){
  int n = 0, ch;
  
  while( !isdigit( ch = fgetc( stdin ) ) );
  do
    n = n * 10 + ch - '0';
  while( isdigit( ch = fgetc( stdin ) ) );
  
  return n;
}

int main(){
  int n, i, q, a, b;
  
  n = getint();
  q = getint();
  
  aib[0].resize( (n + 1) >> 1 );
  aib[1].resize( n >> 1 );
  
  for( i = 0 ; i < n ; i++ )
    update( i, getint() );
  
  for( ; q-- ; ){
    switch( getint() ){
    case 1:
      a = getint() - 1;
      b = getint();
      
      update( a, b );
      break;
    case 2:
      a = getint() - 1;
      b = getint() - 1;
      
      printf( "%d\n", query( a, b ) );
      break;
    }
  }
  
  return 0;
}

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 296 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct

Subtask #2
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 296 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 2 ms 436 KB Output is correct
13 Correct 2 ms 468 KB Output is correct
14 Correct 2 ms 468 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 50 ms 7816 KB Output is correct
2 Correct 48 ms 7840 KB Output is correct
3 Correct 66 ms 7816 KB Output is correct
4 Correct 63 ms 7500 KB Output is correct
5 Correct 50 ms 7524 KB Output is correct

Subtask #5
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 296 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 2 ms 436 KB Output is correct
13 Correct 2 ms 468 KB Output is correct
14 Correct 2 ms 468 KB Output is correct
15 Correct 50 ms 7816 KB Output is correct
16 Correct 48 ms 7840 KB Output is correct
17 Correct 66 ms 7816 KB Output is correct
18 Correct 63 ms 7500 KB Output is correct
19 Correct 50 ms 7524 KB Output is correct
20 Correct 42 ms 7576 KB Output is correct
21 Correct 46 ms 7560 KB Output is correct
22 Correct 47 ms 7556 KB Output is correct
23 Correct 50 ms 7524 KB Output is correct
24 Correct 47 ms 7504 KB Output is correct