Competitive: Java solution

CodeChef/LTIME88B/astonizer/gcdops.java

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+/* package codechef; // don't place package name! */
+
+import java.util.*;
+import java.lang.*;
+import java.io.*;
+
+/* Name of the class has to be "Main" only if the class is public. */
+class Codechef
+{
+    public static void main (String[] args) throws java.lang.Exception
+    {
+        Scanner sc = new Scanner(System.in);
+        PrintWriter pw = new PrintWriter(System.out);
+        int t = sc.nextInt(); 
+        while (t-- > 0) {
+            int n = sc.nextInt();  
+            int[] b = new int[n];
+            boolean check = false;
+            for (int i = 0; i < n; i++) {
+                b[i] = sc.nextInt();
+            }
+            for (int i = 0; i < n; i++) {
+                if ((i+1) % b[i] != 0) {
+                    check = true;
+                    break;
+                }
+            }
+            if(!check) {
+                pw.println("YES");
+            } else {
+                pw.println("NO");
+            }
+        }
+        pw.flush();
+    }
+}

CodeChef/LTIME88B/astonizer/watmelon.java

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+/* package codechef; // don't place package name! */
+
+import java.util.*;
+import java.lang.*;
+import java.io.*;
+
+/* Name of the class has to be "Main" only if the class is public. */
+class Codechef
+{
+    public static void main (String[] args) throws java.lang.Exception
+    {
+        Scanner sc = new Scanner(System.in);
+        PrintWriter pw = new PrintWriter(System.out);
+        int t = sc.nextInt();
+        while(t-- > 0) {
+            int n = sc.nextInt();
+            int[] arr = new int[n];
+            int flag = 0;
+            for(int i = 0; i < n; i++) {
+                arr[i] = sc.nextInt();
+            }
+
+            int sum = 0;
+            for(int i = 0; i < n; i++) {
+                sum += arr[i];
+            }
+
+            if(sum < 0) {
+                System.out.println("NO");
+            } else {
+                System.out.println("YES");
+            }
+        }
+        pw.flush();
+    }
+}