first commit

J03013 - HIỆU SỐ NGUYÊN LỚN - 1.java

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+import java.util.Scanner;
+import java.math.BigInteger;
+
+public class Main{
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        int t = sc.nextInt();
+        while(t-->0){
+            BigInteger a = new BigInteger(sc.next());
+            BigInteger b = new BigInteger(sc.next());
+            int max = Math.max(a.toString().length(), b.toString().length());
+            String ans = a.subtract(b).abs().toString();
+            while(ans.length()<max) ans = "0" + ans;
+            System.out.println(ans);
+        }
+    }
+}