import java.util.*;
import java.io.*;
class Solution {
int testCases;
int wordSize;
int totalBeauty;
int tmpTotalBeauty;
testCases = in.nextInt();
for (int count = 0; count < testCases; count++) {
wordSize = in.nextInt();
in.nextLine(); // flush
word = in.nextLine();
totalBeauty = 0;
tmpTotalBeauty = 0;
for (int i = 0; i < (wordSize + 1) / 2; i++) {
tmpTotalBeauty
+= Character.
getNumericValue(word.
charAt(i
)); }
totalBeauty = tmpTotalBeauty;
for (int pivot = 0; pivot + (wordSize + 1) / 2 < wordSize; pivot++) {
tmpTotalBeauty
-= Character.
getNumericValue(word.
charAt(pivot
)); tmpTotalBeauty
+= Character.
getNumericValue(word.
charAt(pivot
+ (wordSize
+ 1) / 2)); if (totalBeauty < tmpTotalBeauty) {
totalBeauty = tmpTotalBeauty;
}
}
System.
out.
println("Case #" + (count
+1) + ": " + totalBeauty
); }
//in.close();
}
}
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