PRO181829.js

// Solution 1
function solution(board, k) {
  let sum = 0;

  for (let i = 0; i < board.length; i++) {
    for (let j = 0; j < board[i].length; j++) {
      if (i + j <= k) {
        sum += board[i][j];
      }
    }
  }

  return sum;
}