File size: 683 Bytes
3805fe5 bff4ec7 3805fe5 bff4ec7 3805fe5 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | /*@ Extern Coq
(IsMajorityElement : Z -> list Z -> Prop)
*/
/*@ Import Coq Require Import PVbench.Algorithms.majority_element.rocq.spec_lib */
int majorityElement(int* nums, int numsSize)
/*@ With (l : list Z)
Require exists x, IsMajorityElement(x,l) && 1 <= numsSize && numsSize <= 50000 && Zlength(l) == numsSize && IntArray::full(nums, numsSize, l)
Ensure IsMajorityElement(__return, l) && IntArray::full(nums, numsSize, l)
*/
{
int vote = 0;
int candidate = 0;
for (int i = 0; i < numsSize; i++) {
if (vote == 0) {
candidate = nums[i];
}
vote += (nums[i] == candidate) ? 1 : -1;
}
return candidate;
}
|