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  1. public class Main
  2. {
  3. 	public static void main(String[] args) {
  4. 	    int cnt = 111111111;
  5.  
  6. 	    long start = System.currentTimeMillis();
  7. 		for(long i = 1; i < cnt; i++) {
  8. 		    int[] res = digitizeStr(i);
  9. 		}
  10. 		long finish = System.currentTimeMillis();
  11.         long timeElapsed = finish - start;
  12.         System.out.println("digitizeStr: " + timeElapsed);
  13.  
  14. 	    start = System.currentTimeMillis();
  15. 		for(long i = 1; i < cnt; i++) {
  16. 		    int[] res = digitizeStr2(i);
  17. 		}
  18. 		finish = System.currentTimeMillis();
  19.         timeElapsed = finish - start;
  20.         System.out.println("digitizeStr2 (no StringBuilder): " + timeElapsed);
  21.  
  22. 	    start = System.currentTimeMillis();
  23. 		for(long i = 1; i < cnt; i++) {
  24. 		    int[] res = digitize(i);
  25. 		}
  26. 		finish = System.currentTimeMillis();
  27.         timeElapsed = finish - start;
  28.         System.out.println("Division by 10: " + timeElapsed);
  29.     }
  30.  
  31. 	private static int[] digitizeStr(long n) {
  32. 	    String s = String.valueOf(n);
  33. 	    StringBuilder builder = new StringBuilder(s).reverse();
  34. 	    String result = String.valueOf(builder);
  35. 	    int[] array = new int[result.length()];
  36. 	    for(int i = 0; i < result.length(); i++) {
  37. 	        array[i] = result.charAt(i) - '0';
  38. 	    }
  39. 	    return array;
  40. 	}
  41.  
  42. 	private static int[] digitize(long number) {
  43. 	    int length = (int)Math.log10(number) + 1;
  44. 	    int[] digits = new int[length];
  45. 	    for(int i = 0; i < length; i++) {
  46. 	        long m = number % 10;
  47. 	        number = (number - m) / 10;
  48. 	        digits[i] = (int)m;
  49. 	    }
  50. 	    return digits;
  51. 	}
  52.  
  53.     static int[] digitizeStr2(long l) {
  54.         String value = String.valueOf(l);
  55.         int[] array = new int[value.length()];
  56.  
  57.         for (int i = value.length() - 1, j = 0; i >= 0; i--, j++) {
  58.           array[j] = Integer.parseInt(value.substring(i, i + 1));
  59.     }
  60.  
  61.     return array;
  62.   }
  63. }
  64.  
Time limit exceeded #stdin #stdout 5s 116920KB
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https://ideone.com/o6FuC9
language:
Java (HotSpot 12)
created:
3 years ago
visibility:
secret

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