function solve (arr) {


        let sum = 0;

        arr[0].map(par => sum += par);

        let lengthOfArr = arr.length;

        let sum2 = 0;

        let index = 0;



        for (let i = 0; i < lengthOfArr; i++) {


          for (let j = 0; j < arr[i].length; j++) {

            sum2 += arr[i][j];

          }


          if (sum2 !== sum) {

            return false;

          } else {

            sum2 = 0;

          }

        }


        for (let i = 0; i < lengthOfArr; i++) {

          index = 0;

            while (index < lengthOfArr) {

              sum2 += arr[index][i];

              index++;

            }


            if (sum2 !== sum) {

              return false;

            } else {

              sum2 = 0;

            }



        }



        return true;



      }