dojo.js

/**
 * Code Codo Array Splitting
 * Stanley & Jon 
 * https://www.hackerrank.com/challenges/array-splitting
 */

function processData(input) {
    //Enter your code here
    let lines = input.split("\n")
    let num_tests = parseInt(lines[0]);

    for (var i=1; i < lines.length; i+=2) {
        console.log(processArray(convertLineToArray(lines[i+1]), parseInt(lines[i])))
    }
    
} 

function convertLineToArray(line) {
    return line.split(' ').map(digit=>parseInt(digit))    
}

function sumArr(arr) {return arr.reduce((a,b)=>a+b);}

function processArray(arr, len) {
   //console.log(arr);
   if(arr.length <=1){
       return 0;
   }
   let sum = arr.reduce((a,b)=>a+b);

   if (sum % 2 !== 0) {
       // total of Array should be even, otherwise not possible
       return 0;
   }

   // sort the array
   let target = sum/2
 
   let current = 0;
   for (let i=0; i < len; i++) {
       var elm = arr[i];
       current +=elm;
       if (current === target) {
           var sliceA = arr.slice(0, i + 1);
           var sliceB = arr.slice(i + 1)
           var a = processArray(sliceA, sliceA.length);
           var b = processArray(sliceB, sliceB.length);
           return 1 + Math.max(a, b);
       } 
   }
    
   return 0;
}

process.stdin.resume();
process.stdin.setEncoding("ascii");
_input = "";
process.stdin.on("data", function (input) {
    _input += input;
});

process.stdin.on("end", function () {
   processData(_input);
});