const [row, col] = readline().split(" ").map(Number); const used = new Array(row).fill(0).map((v) => new Array(col).fill(0)); const arr = []; let router = []; let start = [0, 0]; while ((line = readline())) { arr.push(line.split(" ")); } let rr = find(arr, start, router, used); for (let i = 0;...