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#include <stdlib.h>
// begin
/**
* Note: The returned array must be malloced, assume caller calls free().
*/
int* plusOne(int* digits, int digitsSize, int* returnSize) {
int *buffer = malloc((digitsSize + 1) * sizeof(int));
for (int i = 0; i < digitsSize; i++) {
buffer[i] = digits[digitsSize - 1 - i];
}
buffer[0]++;
int carry = 0;
for (int i = 0; i < digitsSize; i++) {
int val = buffer[i] + carry;
carry = val / 10;
buffer[i] = val % 10;
}
int len = digitsSize;
if (carry) {
len++;
buffer[digitsSize] = 1;
}
int lp = 0, rp = len - 1;
while (lp <= rp) {
int t = buffer[lp];
buffer[lp] = buffer[rp];
buffer[rp] = t;
lp++;
rp--;
}
*returnSize = len;
return buffer;
}
// end
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