Added 1671A - String Building.cpp

Author: vikashpatel24

1671A - String Building.cpp

@@ -0,0 +1,55 @@
+//                                 ॐ नमः शिवाय
+#include<bits/stdc++.h>
+using namespace std;
+#define ll long long
+ 
+// Code Written By: Vikash Patel
+// Codeforces Profile: https://codeforces.com/profile/vikashpatel
+
+
+bool solve(string s)
+{
+    int j = 0;
+    int i;
+    for(i=0; i<s.size(); i++)
+    {
+        string s1 = s.substr(j+i, 2);
+        string s2 = s.substr(j+i, 3);
+        if(s2 == "aaa" || s2 == "bbb")
+        i += 3;
+        else if(s1 == "aa" || s1 == "bb")
+        i += 2;
+        j = i;
+    }
+}
+
+int main()
+{
+    int t;
+    cin>>t;
+    while(t--)
+    {
+        string s;
+        cin>>s;
+        bool  ans = 1;
+        for(int i=0; i<s.size(); i++)
+        {
+            int c = 1;
+            while(s[i]==s[i+1] && i+1<s.size())
+            {
+                c++;
+                i++;
+            }
+            if(c<2)
+            {
+                ans = 0;
+                break;
+            }
+        }
+        if(ans)
+        cout<<"YES"<<endl;
+        else
+        cout<<"NO"<<endl;
+    }
+    return 0;
+}