var hash = '#';
var space = '\n';
var tab = '  ';

//лесенка
function drawingLadder (height) {

	var ladderString = '';
	for(var i = 1; i <= height; i++){
		var j = i;
		while (j > 0) {
			ladderString += hash;
			j--;
		}
		ladderString += space;
	}

	alert(ladderString);
}

drawingLadder(5);



//шахматная доска
function drawingCheckers (height, width){
	var ladderString = '';
	for(var i = 1; i <= height; i++){

		for(var j = 1; j <= width; j++){

			if (i%2 !== 0){
				if(j%2 !== 0) {
					ladderString += hash;
				} else {
					ladderString += tab;
				}
			} else {
				if(j%2 !== 0) {
					ladderString += tab;
				} else {
					ladderString += hash;
				}
			}

		}

		ladderString += space;
	}


	alert(ladderString);
}

drawingCheckers (9, 9);

//треугольники

function drawingTriangleOne (height){
	var ladderString = '';
	var tab = '  ';
	for(var i = height; i >= 1; i--){
		var j = i-1;
		while (j > 0) {
			ladderString = ladderString + tab;
			j--;
		}
		j = i - 1;
		while (j < height){
			ladderString = ladderString + hash;
			j++;
		}
		ladderString = ladderString + space;
	}


	alert(ladderString);
}

drawingTriangleOne(5);




function drawingTriangleTwo (height) {
	var ladderString = '';

	for(var i = height; i >= 1; i--){
		var j = i;
		while (j > 0) {
			ladderString = ladderString + hash;
			j--;
		}
		ladderString = ladderString + space;
	}

	alert(ladderString);
}

drawingTriangleTwo(5);



function drawingTriangleThree (height){

	var ladderString = '';
	for(var i = height; i >= 1; i--){
		var j = i-1;
		while (j < height) {
			ladderString = ladderString + tab;
			j++;
		}
		j = i;
		while (j >0){
			ladderString = ladderString + hash;
			j--;
		}
		ladderString = ladderString + space;
	}


	alert(ladderString);
}

drawingTriangleThree(5);