66.c

#include<stdio.h>
#include<stdlib.h>

int*plusOne(int*digits, intdigitsSize, int*returnSize) {
int*ans= (int*)malloc((digitsSize+1) *sizeof(int));
*returnSize=digitsSize;
inti;
intsum=1; /* plus one */
for (i=digitsSize-1; i >= 0; i--) {
sum+=digits[i];
ans[i+1] =sum % 10;
sum /= 10;
 }
if (sum) {
ans[0] =sum;
*returnSize=*returnSize+1;
returnans;
 }
else {
returnans+1;
 }
}

intmain() {
intA[] = { 9, 9, 9 };
intretSize=0;
int*ans=plusOne(A, sizeof(A) / sizeof(A[0]), &retSize);
inti;
for (i=0; i<retSize; i++) {
printf("%d ", ans[i]);
 }
printf("\n");
return0;
}