80.c

#include<stdio.h>

intremoveDuplicates(int*nums, intnumsSize) {
if (nums==NULL||numsSize==0) return0;

intstoreIndex=0;
inti=0;
while (i<numsSize) {
intcount=1;
while (i<numsSize-1&&nums[i] ==nums[i+1]) {
i++;
count++;
if (i >= numsSize) goto OUT;
 }
if (count >= 2) {
nums[storeIndex++] =nums[i];
nums[storeIndex++] =nums[i];
 }
else {
nums[storeIndex++] =nums[i];
 }
i++;
 }
OUT:
returnstoreIndex;
}

intmain() {
intnums[] = { 1, 1, 1, 2, 2, 3, 3, 3, 4, 5, 5 };
intnew_len=removeDuplicates(nums, sizeof(nums) / sizeof(nums[0]));

inti;
for (i=0; i<new_len; i++) {
printf("%d ", nums[i]);
 }
printf("\n");

return0;
}