import java.util.*; import java.util.zip.*; import java.util.List; import java.util.regex.*; import java.util.concurrent.*; import java.util.concurrent.atomic.*; import java.util.concurrent.locks.*; import java.util.function.*; import javax.swing.*; import javax.swing.event.*; import javax.swing.text.*; import javax.swing.table.*; import java.io.*; import java.net.*; import java.lang.reflect.*; import java.lang.ref.*; import java.lang.management.*; import java.security.*; import java.security.spec.*; import java.awt.*; import java.awt.event.*; import java.awt.image.*; import java.awt.geom.*; import javax.imageio.*; import java.math.*; import java.time.Duration; import java.lang.invoke.VarHandle; import java.lang.invoke.MethodHandles; // use sub-array of array2, fixed length of array1 = 1024 bits class main { static int countDifferingBits_1024bit(long[] array1, long[] array2, int i1) { int diff = 0; for (int i = 0; i < 1024/64; i++) diff += popCount(array1[i]^array2[i1+i]); return diff; } static int popCount(int i) { return Integer.bitCount(i); } static int popCount(long l) { return Long.bitCount(l); } }