Blynk-Water-Level-Sensor | Monitoring water level in a small glass

public int trap(int[] height) {
        int l = 0;
        int r = height.length - 1;
        int res = 0;
        int lowerWall = 0;
        while (l < r) {
            int lVal = height[l];
            int rVal = height[r];
            // If lef  

public int trapRainWater(int[][] heightMap) {
        if (heightMap.length == 0) {
            return 0;
        }
        PriorityQueue walls = new PriorityQueue<>();
        water = 0;
        visited1 = new boolean[heightMap.length][heightMa  

public int swimInWater(int[][] grid) {
        int max = 0;
        // find the maximum value in the matrix
        for (int[] ints : grid) {
            for (int j = 0; j < grid[0].length; j++) {
                max = Math.max(max, ints[j]);