Method findRowSum

MagicSquaresInGrid.java:2–24

(int grid[][], int r, int c)

class Solution {
    public int findRowSum(int grid[][], int r, int c){
       boolean visited[] = new boolean[10];
       int sum=0;
       for(int i=0;i<3;i++){
        int rowSum=0;
        for(int j=0;j<3;j++){
            int val = grid[r+i][c+j];
            if(val==0 || val>=10 || visited[val]){
                return -1;
            }
            visited[val] = true;
            rowSum+=val;
        }
        if(i==0){
            sum = rowSum;
        }else{
            if(sum!=rowSum){
                return -1;
            }
        }
       }
       return sum;
    }

    public int findColSum(int grid[][], int r, int c){
       int sum=0;