leet-code/src/main/java/leetcode/editor/cn/FindMajorityElementLcci.java

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//数组中占比超过一半的元素称之为主要元素。给你一个 整数 数组,找出其中的主要元素。若没有,返回 -1 。请设计时间复杂度为 O(N) 、空间复杂度为 O(1
//) 的解决方案。
//
//
//
// 示例 1
//
//
//输入:[1,2,5,9,5,9,5,5,5]
//输出5
//
// 示例 2
//
//
//输入:[3,2]
//输出:-1
//
// 示例 3
//
//
//输入:[2,2,1,1,1,2,2]
//输出2
// Related Topics 数组 计数
// 👍 134 👎 0
package leetcode.editor.cn;
//面试题 17.10:主要元素
public class FindMajorityElementLcci {
public static void main(String[] args) {
//测试代码
Solution solution = new FindMajorityElementLcci().new Solution();
}
//力扣代码
//leetcode submit region begin(Prohibit modification and deletion)
class Solution {
public int majorityElement(int[] nums) {
int nu = -1;
int count = 0;
for (int num : nums) {
if (count == 0) {
nu = num;
}
if (nu == num) {
count++;
} else {
count--;
}
}
count = 0;
for (int num : nums) {
if (nu == num) {
count++;
}
}
return count * 2 > nums.length ? nu : -1;
}
}
//leetcode submit region end(Prohibit modification and deletion)
}