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public int solve(int[] A) {
int n = A.length;
boolean flag = false;
if(n == 1)
return 1;
for(int i = 1 ; i < n ; i++){
if(A[i] < A[i-1]){
int temp = A[i];
A[i] = A[i-1];
A[i-1] = temp;
if(Math.abs(A[i-1]-A[i]) > 1){
flag = true;
break;
}
}
}//loop
return flag ? 0 : 1;
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