【百日算法计划】:每日一题,见证成长(018)
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;
}
}
}
原文地址:https://blog.csdn.net/yqq962464/article/details/142393029
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