Added 1821A - Matching.cpp

Author: vikashpatel24

1821A - Matching.cpp

@@ -0,0 +1,34 @@
+//                                 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
+
+int solve(string s)
+{
+    int ans=1;
+    if(s[0]=='0')
+    return 0;
+    for(int i=1;i<s.size();i++)
+    {
+        if(s[i]=='?')
+        ans *= 10;
+    }
+    if(s[0]=='?')
+    ans *= 9;
+    return ans;
+}
+int main()
+{
+    int t;
+    cin>>t;
+    while(t--)
+    {
+        string s;
+        cin>>s;
+        cout<<solve(s)<<endl;
+    }
+    return 0;
+}