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Equilibrium_Point.java
44 lines (36 loc) · 1.16 KB
/
Equilibrium_Point.java
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import java.io.*;
import java.util.*;
class Equilibrium {
public static void main(String[] args) throws IOException {
BufferedReader br =
new BufferedReader(new InputStreamReader(System.in));
int t =
Integer.parseInt(br.readLine().trim()); // Inputting the testcases
while (t-- > 0) {
int n = Integer.parseInt(br.readLine().trim());
long arr[] = new long[n];
String inputLine[] = br.readLine().trim().split(" ");
for (int i = 0; i < n; i++) {
arr[i] = Long.parseLong(inputLine[i]);
}
EquilibriumPoint obj = new EquilibriumPoint();
System.out.println(obj.equilibriumPoint(arr, n));
}
}
}
class EquilibriumPoint {
public static int equilibriumPoint(long arr[], int n) {
long sum = 0;
long left_sum = 0;
for(int i = 0; i<n; i++){
sum += arr[i];
}
for(int i = 0; i<n; i++){
sum -= arr[i];
if( sum == left_sum )
return i+1;
left_sum += arr[i];
}
return -1;
}
}