| /*@ 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; | |
| } | |