Create 434. Number of Segments in a String.md

434. Number of Segments in a String.md

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+# [434. Number of Segments in a String](https://leetcode.com/problems/number-of-segments-in-a-string/description/)
+# 思路
+计算一个字符串被空格分成了多少部分。   
+从头至尾遍历字符串，用tag标记当前字符的前一个字符是否是空格，若tag=1则前面是空格否则不是。若当前字符不是空格且tag==1则count应该加1。 
+# C++
+```
+class Solution {
+public:
+    int countSegments(string s) {
+        int tag = 1, res = 0;
+        for(int p = 0; p < s.size(); p++){
+            if(s[p] == ' ') tag = 1;
+            else if(tag == 1){ // 当前字符不是空格且tag==1
+                res++;
+                tag = 0;
+            }
+        }
+        return res;
+    }
+};
+```