function search(row, column) {
    if (row < 0 || row >= rowsCount)
        return 0;

    if (column < 0 || column >= columnsCount)
        return 0;

    if (house[row][column] === "#")
        return 0;

    if (house[row][column] === "~")
        return 0;

    house[row][column] = "~";

    return 1 + search(row, column + 1) + search(row, column - 1) + search(row + 1, column);
}

function startFlowProcess() {
    var cellsCount = 0;
    for (var i = 0; i < columnsCount; i++) {
        cellsCount += search(0, i);
    }

    return cellsCount;
}

var building = require("fs").readFileSync("./solution-2-building.txt", { encoding: "utf-8" });
var houseAsStrings = building.split("\r\n");

var rowsCount = houseAsStrings.length;
var columnsCount = houseAsStrings[0].length;

var house = new Array(columnsCount);

for (var i = 0; i < rowsCount; i++) {
    house[i] = new Array(columnsCount);
    for (var j = 0; j < columnsCount; j++) {
        house[i][j] = houseAsStrings[i][j];
    }
}

var count = startFlowProcess();

console.log(count);