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l33tcode_reversewords/Cpp/l33tcode_reversewords.cpp

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+// https://leetcode.com/problems/reverse-words-in-a-string/
+
+#include <iostream>
+#include <cstring>
+#include <string>
+#include <string_view>
+#include <vector>
+
+using namespace std;
+
+static string_view findWord(const string& str, size_t &index)
+{   
+    size_t startIndex, endIndex;
+
+    // Start of word
+    while (index < str.size() && isspace(str[index])) index++;
+    startIndex = index;
+
+    // Last letter
+    while (index < str.size() && !isspace(str[index])) index++;
+    endIndex = index;
+
+    return string_view(str.c_str() + startIndex, endIndex - startIndex);
+
+}
+
+class Solution {
+public:
+    string reverseWords(string s) {
+        vector<string_view> words;
+        size_t index = 0;
+        do
+        {
+            string_view sv = findWord(s, index);
+            if (!sv.empty())
+            {
+                words.push_back(sv);
+            }
+        } while (index < s.size());
+        
+        string toRet;
+        toRet.reserve(s.size());
+
+        for (auto iter = words.crbegin(); iter != words.crend(); iter++)
+        {
+            toRet += *iter;
+            toRet += " ";
+        }
+        toRet.resize(toRet.size() - 1);
+
+        return toRet;
+
+    }
+};
+
+int main()
+{
+    Solution s;
+    cout << s.reverseWords("the sky is blue") << endl;
+    cout << s.reverseWords("  hello world  ") << endl;
+    cout << s.reverseWords("a good   example") << endl;
+    cout << s.reverseWords("  Bob    Loves  Alice   ") << endl;
+}
+