matrix

matrix.js

/*
3
11 2 4
4 5 6
10 8 -12
*/


//11 + 5  -12 = 4
//4 + 5 + 10 = 19
//output: 19 - 4 - 5;

/*
const n = 3;
const ary = [[11,2,4],[4,5,6],[10,8,-12]];

//11 + 5  -12 = 4
let plus = 0;
let minus = (n-1);
let plusSum = 0;
let minusSum = 0;
ary.forEach( (i) => {
    i.forEach( (j,k) =>{
        if(plus == k){
            //console.log(j);
            plusSum = plusSum + j;
        }
        if(minus == k){
            //console.log(j);
            minusSum = minusSum + j;
        }
    });
    plus++;
    minus--;
});

console.log(plusSum);
console.log(minusSum);
console.log(minusSum - plusSum);
*/


const arr = [[3],["11 2 4"],["4 5 6"],["10 8 -12"]];

let plus = 0;
let minus = (arr[0]-1);
let plusSum = 0;
let minusSum = 0;
arr.forEach( (i,index) => {
    if(index ==0){
        return;
    }
    const item = i[0].split(/\s/);
    item.forEach( (j,k) =>{
        if(plus == k){
            //console.log(j);
            plusSum = plusSum + parseInt(j,10);
        }
        if(minus == k){
            //console.log(j);
            minusSum = minusSum + parseInt(j,10);
        }
    });
    plus++;
    minus--;
});

console.log(plusSum);
console.log(minusSum);
console.log(minusSum - plusSum);