Solution.ts

function swimInWater(grid: number[][]): number {
    const m = grid.length,
        n = grid[0].length;
    let visited = Array.from({ length: m }, () => new Array(n).fill(false));
    let ans = 0;
    let stack = [[0, 0, grid[0][0]]];
    const dir = [
        [0, 1],
        [0, -1],
        [1, 0],
        [-1, 0],
    ];

    while (stack.length) {
        let [i, j] = stack.shift();
        ans = Math.max(grid[i][j], ans);
        if (i == m - 1 && j == n - 1) break;
        for (let [dx, dy] of dir) {
            let x = i + dx,
                y = j + dy;
            if (x < m && x > -1 && y < n && y > -1 && !visited[x][y]) {
                visited[x][y] = true;
                stack.push([x, y, grid[x][y]]);
            }
        }
        stack.sort((a, b) => a[2] - b[2]);
    }
    return ans;
}