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switching light bulbs
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//'main' method must be in a class 'Rextester'. //Compiler version 1.8.0_111 import java.util.*; import java.lang.*; class Rextester { public static int lightBulbs(int num){ int count = 0; for(int i =1;i<=100;i++){ int swc = 0; for(int j = 1;j<=i;j++){ if(i%j==0){ swc++; } } if(swc%2!=0){ count++; } swc = 0; } return count; } public static int lightBulbs_fast(int num) { return (int)Math.sqrt(num); } public static void main(String args[]) { System.out.println("Hello, World!"); System.out.println(lightBulbs(100)); } }
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Compilation time: 1.33 sec, absolute running time: 0.19 sec, cpu time: 0.18 sec, memory peak: 18 Mb, absolute service time: 1,52 sec
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