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 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 javax.imageio.*; import java.math.*; class main { static double cos_squareWave(double phi) { /*double phase = frac(phi/(pi()*2)); ret phase < .5 ? 1 : -1;*/ throw todo(); } static RuntimeException todo() { throw new RuntimeException("TODO"); } static RuntimeException todo(Object msg) { throw new RuntimeException("TODO: " + msg); } }