Merge pull request #178 from Jagpreet153/day_20_medium_Jagpreet153

medium/day_20/solution.cpp

@@ -1 +1,41 @@
-//write your code here
+//write your code here
+//Code by Jagpreet153
+#include <bits/stdc++.h>
+using namespace std;
+
+int main() {
+    long long res = 1;
+    string b;
+    cin >> b;
+    vector<bool> z(10, true);
+    int num0 = 0;
+    int num = 0;
+    if (b[0] == '?') 
+    res = 9;
+    else if (b[0] - 'A' < 10 && b[0] - 'A' >= 0) 
+    {
+        res = 9;
+        z[b[0] - 'A'] = false;
+        num++;
+    }
+    for (int i = 1; i < b.size(); i++) 
+    {
+        if (b[i] == '?')
+         num0++;
+         else if (b[i] - 'A' < 10 && b[i] - 'A' >= 0) 
+         {
+            if (z[b[i] - 'A']) 
+            {
+                res *= 10 - num;
+                num++;
+                z[b[i] - 'A'] = false;
+            }
+        }
+    }
+    cout << res;
+    for (int i = 0; i < num0; i++) {
+        cout << "0";
+    }
+
+    return 0;
+}