30 lines
720 B
Java
30 lines
720 B
Java
package nyagami;
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import java.util.Scanner;
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public class test{
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public static void main(String[] arg){
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Scanner sc = new Scanner(System.in);
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int t = sc.nextInt();
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while(t-->0){
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int n = sc.nextInt();
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int[] a = new int[n+1];
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for(int i=1;i<n+1;i++){
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a[i] = sc.nextInt();
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a[i]+=a[i-1];
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}
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boolean oke = true;
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for(int i=2;i<n;i++){
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if(a[i-1]==(a[n]-a[i])){
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System.out.println(i);
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oke = false;
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break;
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}
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}
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if(oke) System.out.println(-1);
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}
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sc.close();
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}
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}
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