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package Algorithms.array;

public class PlusOne {

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

if (digits == null) {

return null;

}

int overFlow = 0;

int len = digits.length;

int[] ret = new int[len];

for (int i = len - 1; i >= 0; i--) {

int sum = digits[i] + overFlow;

if (i == len - 1) {

// 只有最后一位需要加1

sum++;

}

// 溢出的话，置溢出位。

if (sum > 9) {

overFlow = 1;

} else {

overFlow = 0;

}

// 把高位去掉，因为我们要0-9

ret[i] = sum % 10;

}

if (overFlow == 1) {

int[] retOver = new int[len + 1];

System.arraycopy(retOver, 1, ret, 0, len);

retOver[0] = 1;

return retOver;

}

return ret;

}

}