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题目

删除连续重复字符

字符串删除掉连续的3个重复的字符，比如"abbbc" 返回"ac" ，“abbbaad” 返回"d"

思路

• 构造一个对象，属性为元素及个数；
• 将对象加入到栈中，同时判断其元素的个数；
• 当元素个数等于 3 时，则弹出栈。

public class Code02 {Stack<CharWithCount> stack = new Stack<>();/*** 用栈记录不能消除的元素* @param str* @return*/public String remove(String str){int n = str.length();for (int i = 0; i < n; i++) { //顺序处理每个字符char c = str.charAt(i);//栈为空if (stack.isEmpty()){stack.push(new CharWithCount(c, 1));continue;}//栈不为空 栈顶元素跟c比较 且不相同CharWithCount topChar = stack.peek();if (topChar.c != c){stack.push(new CharWithCount(c, 1));continue;}//栈顶元素跟c相同，比较个数，如果已有2个，则弹出if (topChar.count == 2){stack.pop();continue;}//栈顶元素跟c相同 但不满足连连消topChar.count++;}//最后开始输出栈里面的元素int size = stack.size();char[] arr = new char[size];while (!stack.isEmpty()){char c = stack.pop().c;arr[size-1] = c;size--;}StringBuilder sb = new StringBuilder();for (int i = 0; i < arr.length; i++) {sb.append(String.valueOf(arr[i]));}return sb.toString();}public class CharWithCount{public char c;public int count;public CharWithCount(){}public CharWithCount(char c,int count){this.c = c;this.count = count;}}
}