View difference between Paste ID: AGsH8PsC and chESN7H9

 import java.util.*;
-import  java.io.*;
+import java.io.*;
 
 public class Main {
 
-    public static void main(String[] args)throws IOException {
+    public static void main(String[] args) throws IOException {
         Scanner sc = new Scanner(new File("input.txt"));
         int a = sc.nextInt();
         sc.close();
-        int b=0;
+
-        int i;
+        int b = 0;
-        if(a==0) {
+
         if (a == 0) {
-        }else if(a>0) {
+
-            b = ((1+(a))*(a))/2;
+        } else if (a > 0) {
-            }else if(a<0) {
+            b = ((1 + a) * a) / 2;
-            for (i = 1; i <= a; i--) {
+        } else if (a < 0) {
             for (int i = 1; i <= a; i--) {
                 b += i;
             }
         }
 
         PrintWriter pw = new PrintWriter(new File("output.txt"));
         pw.print(b);
         pw.close();
     }
 }