Create 1358. Number of Substrings Containing All Three Characters

1358. Number of Substrings Containing All Three Characters

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+class Solution {
+public:
+    int numberOfSubstrings(std::string s) {
+        std::vector<int> count(3, 0); 
+        int left = 0; 
+        int result = 0; 
+        for (int i = 0; i < s.length(); i++) {
+            count[s[i] - 'a']++; 
+
+            while (count[0] > 0 && count[1] > 0 && count[2] > 0) {
+                result += s.length() - i; 
+                count[s[left] - 'a']--; 
+                left++; 
+            }
+        }
+        return result; 
+    }
+};