1. PermCheck 桃花顺检验 Check whether array A is a permutation.

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1. PermCheck 桃花顺检验 Check whether array A is a permutation.

package com.code; import java.util.Arrays; public class Test04_2 { public static int solution(int[] A) { int size = A.length; if(size == 1){ return A[0]==1?1:0; } Arrays.sort(A); for(int i=0;i<size;i++){ if(A[i]!=i+1){ return 0; } } return 1; } publi…

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Task description A non-empty zero-indexed array A consisting of N integers is given. A permutation is a sequence containing each element from 1 to N once, and only once. For example, array A such that: A[0] = 4 A[1] = 1 A[2] = 3 A[3] = 2 is a permuta…