栈顶是相同元素就入栈,栈顶是不同元素就出栈。最后栈里剩下的就是出现超过一半的那个元素。
import java.util.Stack;
public class Solution {
public int MoreThanHalfNum_Solution(int [] array) {
Stack<Integer> stack = new Stack<>();
for(int i=0; i<array.length; i++){
if(stack.isEmpty()){
stack.push(array[i]);
}else{
int st = stack.get(stack.size()-1);
if(st == array[i])
stack.push(array[i]);
else
stack.pop();
}
}
return stack.pop();
}
}