Diagonal Difference (JavaScript)

HackerRank problem Diagonal Difference using JavaScript:

 function processData(input) {  
   var lines = input.split("\n");  
   var arr = [];  
   for (var i = 1; i < lines.length; i++) {  
     arr.push(lines[i].split(" "));  
   }  
   var sumTopLeft = 0;  
   var sumBotLeft = 0;  
   for (var j = 0; j < arr.length; j++) {  
     sumTopLeft += parseInt(arr[j][j]);  
   }  
   var count = -1;  
   for (var k = arr.length - 1; k >= 0; k--) {  
     count++;  
     sumBotLeft += parseInt(arr[k][count]);  
   }  
   var diff = Math.abs(sumTopLeft - sumBotLeft);  
   console.log(diff);  
 }   
 process.stdin.resume();  
 process.stdin.setEncoding("ascii");  
 _input = "";  
 process.stdin.on("data", function (input) {  
   _input += input;  
 });  
 process.stdin.on("end", function () {  
   processData(_input);
 });  

Test results:
Test Case #0:   0.09s
Test Case #1:   0.09s
Test Case #2:   0.1s
Test Case #3:   0.1s
Test Case #4:   0.09s
Test Case #5:   0.09s
Test Case #6:   0.09s
Test Case #7:   0.09s
Test Case #8:   0.09s
Test Case #9:   0.1s
Test Case #10:   0.09s