代码实现：

思路：摩尔投票算法

int majorityElement(int *nums, int numsSize) {
    int candidate = -1;
    int count = 0;
    for (int i = 0; i < numsSize; i++) {
        if (count == 0) {
            candidate = nums[i];
        }
        if (nums[i] == candidate) {
            count++;
        } else {
            count--;
        }
    }
    count = 0;
    int length = numsSize;
    for (int i = 0; i < numsSize; i++) {
        if (nums[i] == candidate) {
            count++;
        }
    }
    return count * 2 > length ? candidate : -1;
}