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package algorithms.easy;

public class PlusOne {

public static int[] plusOne(int[] digits) {

int plusOne = 1;

for (int i = digits.length - 1; i >= -1; i--) {

if (plusOne == 0) {

return digits;

}

if (i < 0) {

int[] extendDigits = new int[digits.length + 1];

extendDigits[0] = plusOne;

System.arraycopy(digits, 0, extendDigits, 1, digits.length);

return extendDigits;

}

plusOne += digits[i];

if (plusOne > 9) {

digits[i] = plusOne % 10;

} else {

digits[i] = plusOne;

}

plusOne /= 10;

}

return digits;

}

public static int[] plusOne1(int[] digits) {

for (int i = digits.length - 1; i >= 0; i--) {

if (digits[i] < 9) {

digits[i]++;

return digits;

}

digits[i] = 0;

}

int[] extDigits = new int[digits.length + 1];

extDigits[0] = 1;

return extDigits;

}

}