Create count-number-of-homogenous-substrings.cpp

Author: kamyu104

C++/count-number-of-homogenous-substrings.cpp

@@ -0,0 +1,19 @@
+// Time:  O(n)
+// Space; O(1)
+
+class Solution {
+public:
+    int countHomogenous(string s) {
+        static const int MOD = 1e9 + 7;
+        int cnt = 0, result = 0;
+        for (int i = 0; i < size(s); ++i) {
+            if (i > 0 && s[i - 1] == s[i]) {
+                ++cnt;
+            } else {
+                cnt = 1;
+            }
+            result = (result + cnt) % MOD;
+        }
+        return result;
+    }
+};