java https://codility.com/programmers/lessons/

Posted 2021-05-08

public class TapeEquilibrium {
	/* 
	 * 100% solution 
	 * https://codility.com/demo/results/demo3VDKT8-AG5/
	 */
	    public int solution(int[] A) {
	        int start = A[0];
	        int end = sum(A, 1);
	        int minDif = Math.abs(start - end);
	         
	        for (int index = 1; index < A.length-1; index++) {
	            start += A[index];
	            end -= A[index];
	            if (Math.abs(start - end) < minDif)
	                minDif = Math.abs(start - end);
	        }
	        return minDif;
	    }
	     
	    public int sum(int[] A, int P) {
	        int result = A[P];  
	        for ( ; P < A.length-1; P++)
	            result += A[P+1];
	         
	        return result;
	    }
}

import java.util.*;

public class PermMissingElem {
	/* 
	 * 100% solution 
	 * https://codility.com/demo/results/demoRZDAXR-HJX/
	 */
	public int solution(int[] A) {
		int missingNum = 0;
	        if (A.length != 0) {
		        Arrays.sort(A);
		        for (int currentNum : A) {
		        	if (++missingNum != currentNum)
		                    return missingNum;
		        }
	        	
		}
	        return ++missingNum;
		
	}
}

public class FrgJump {
	/* 
	 * 100% solution 
	 * https://codility.com/demo/results/demoD644JF-Z36/
	 */
	public int solution(int X, int Y, int D) {
		int distance = Y - X;
		return (distance % D == 0) ? (distance / D) : ((distance / D) + 1);
	}
}