385:迷你语法分析器

LeetCode/src/main/java/com/code/leet/entiy/NestedInteger.java

@@ -7,16 +7,44 @@ import java.util.List;
  * @Date: 2020-02-13 19:19
  */
 
-public interface NestedInteger {
+public class NestedInteger {
+
+    private Integer value;
+    private List<NestedInteger> list;
+
+    // Constructor initializes an empty nested list.
+    public NestedInteger() {
+    }
+
+    // Constructor initializes a single integer.
+    public NestedInteger(int value) {
+        this.value = value;
+    }
 
     // @return true if this NestedInteger holds a single integer, rather than a nested list.
-    public boolean isInteger();
+    public boolean isInteger() {
+        return list.size() > 0;
+    }
 
     // @return the single integer that this NestedInteger holds, if it holds a single integer
     // Return null if this NestedInteger holds a nested list
-    public Integer getInteger();
+    public Integer getInteger(){
+        return value;
+    }
+
+    // Set this NestedInteger to hold a single integer.
+    public void setInteger(int value){
+        this.value = value;
+    }
+
+    // Set this NestedInteger to hold a nested list and adds a nested integer to it.
+    public void add(NestedInteger ni){
+        list.add(ni);
+    }
 
     // @return the nested list that this NestedInteger holds, if it holds a nested list
-    // Return null if this NestedInteger holds a single integer
-    public List<NestedInteger> getList();
+    // Return empty list if this NestedInteger holds a single integer
+    public List<NestedInteger> getList(){
+        return list;
+    }
 }

LeetCode/src/main/java/leetcode/editor/cn/MiniParser.java

@@ -0,0 +1,109 @@
+//给定一个用字符串表示的整数的嵌套列表，实现一个解析它的语法分析器。 
+//
+// 列表中的每个元素只可能是整数或整数嵌套列表 
+//
+// 提示：你可以假定这些字符串都是格式良好的： 
+//
+// 
+// 字符串非空 
+// 字符串不包含空格 
+// 字符串只包含数字0-9、[、-、,、] 
+// 
+//
+// 
+//
+// 示例 1： 
+//
+// 给定 s = "324",
+//
+//你应该返回一个 NestedInteger 对象，其中只包含整数值 324。
+// 
+//
+// 示例 2： 
+//
+// 给定 s = "[123,[456,[789]]]",
+//
+//返回一个 NestedInteger 对象包含一个有两个元素的嵌套列表：
+//
+//1. 一个 integer 包含值 123
+//2. 一个包含两个元素的嵌套列表：
+//    i.  一个 integer 包含值 456
+//    ii. 一个包含一个元素的嵌套列表
+//         a. 一个 integer 包含值 789
+// 
+// Related Topics 栈 字符串 
+// 👍 58 👎 0
+
+package leetcode.editor.cn;
+
+import com.code.leet.entiy.NestedInteger;
+
+//385:迷你语法分析器
+public class MiniParser {
+    public static void main(String[] args) {
+        //测试代码
+        Solution solution = new MiniParser().new Solution();
+    }
+    //力扣代码
+    //leetcode submit region begin(Prohibit modification and deletion)
+
+    /**
+     * // This is the interface that allows for creating nested lists.
+     * // You should not implement it, or speculate about its implementation
+     * public interface NestedInteger {
+     * // Constructor initializes an empty nested list.
+     * public NestedInteger();
+     * <p>
+     * // Constructor initializes a single integer.
+     * public NestedInteger(int value);
+     * <p>
+     * // @return true if this NestedInteger holds a single integer, rather than a nested list.
+     * public boolean isInteger();
+     * <p>
+     * // @return the single integer that this NestedInteger holds, if it holds a single integer
+     * // Return null if this NestedInteger holds a nested list
+     * public Integer getInteger();
+     * <p>
+     * // Set this NestedInteger to hold a single integer.
+     * public void setInteger(int value);
+     * <p>
+     * // Set this NestedInteger to hold a nested list and adds a nested integer to it.
+     * public void add(NestedInteger ni);
+     * <p>
+     * // @return the nested list that this NestedInteger holds, if it holds a nested list
+     * // Return empty list if this NestedInteger holds a single integer
+     * public List<NestedInteger> getList();
+     * }
+     */
+    class Solution {
+        public NestedInteger deserialize(String s) {
+            int length = s.length();
+            if (length == 0) {
+                return new NestedInteger();
+            }
+            if (s.charAt(0) != '[') {
+                return new NestedInteger(Integer.parseInt(s));
+            }
+            if (length == 2) {
+                return new NestedInteger();
+            }
+
+            NestedInteger nestedInteger = new NestedInteger();
+            int start = 1, i = 1, count = 0;
+            while (i < length) {
+                if (count == 0 && (s.charAt(i) == ',' || s.length() - 1 == i)) {
+                    nestedInteger.add(deserialize(s.substring(start, i)));
+                    start = i + 1;
+                } else if (s.charAt(i) == '[') {
+                    count++;
+                } else if (s.charAt(i) == ']') {
+                    count--;
+                }
+                i++;
+            }
+            return nestedInteger;
+        }
+    }
+//leetcode submit region end(Prohibit modification and deletion)
+
+}

LeetCode/src/main/java/leetcode/editor/cn/MiniParser.md

@@ -0,0 +1,34 @@
+<p>给定一个用字符串表示的整数的嵌套列表，实现一个解析它的语法分析器。</p>
+
+<p>列表中的每个元素只可能是整数或整数嵌套列表</p>
+
+<p><strong>提示：</strong>你可以假定这些字符串都是格式良好的：</p>
+
+<ul>
+	<li>字符串非空</li>
+	<li>字符串不包含空格</li>
+	<li>字符串只包含数字<code>0-9</code>、<code>[</code>、<code>-</code>、<code>,</code>、<code>]</code></li>
+</ul>
+
+<p>&nbsp;</p>
+
+<p><strong>示例 1：</strong></p>
+
+<pre>给定 s = &quot;324&quot;,
+
+你应该返回一个 NestedInteger 对象，其中只包含整数值 324。
+</pre>
+
+<p><strong>示例 2：</strong></p>
+
+<pre>给定 s = &quot;[123,[456,[789]]]&quot;,
+
+返回一个 NestedInteger 对象包含一个有两个元素的嵌套列表：
+
+1. 一个 integer 包含值 123
+2. 一个包含两个元素的嵌套列表：
+    i.  一个 integer 包含值 456
+    ii. 一个包含一个元素的嵌套列表
+         a. 一个 integer 包含值 789
+</pre>
+<div><div>Related Topics</div><div><li>栈</li><li>字符串</li></div></div>\n<div><li>👍 58</li><li>👎 0</li></div>