[19-w4-d4]classPhotos.js

// It's photo day at the local school, and you're the photographer assigned to take class photos.
// The class that you'll be photographing has an even number of students, and all these students are
// wearing red or blue shirts. In fact, exactly half of the class is wearing red shirts, and the other
// half is wearing blue shirts. You're responsible for arranging the students in two rows before taking
// the photo. Each row should contain the same number of the students and should adhere to the following
// guidelines:
// - All students wearing red shirts must be in the same row.
// - All students wearing blue shirts must be in the same row.
// - Each student in the back row must be strictly taller than the student directly in front of them in
// the front row.

// You're given two input arrays: one containing the heights of all the students with red shirts and
// another one containing the heights of all the students with blue shirts. These arrays will always
// have the same length, and each height will be a positive integer.

// Write a function that returns whether or not a class photo that follows the stated guidelines can
// be taken.

// Note: you can assume that each class has at least 2 students.

function classPhotos(redShirtHeights, blueShirtHeights) {
	redShirtHeights.sort((a, b) => a - b);
	blueShirtHeights.sort((a, b) => a - b);
	if (redShirtHeights[0] > blueShirtHeights[0]) {
		for (let i = 0; i < redShirtHeights.length; i++) {
			if (
				redShirtHeights[i] < blueShirtHeights[i] ||
				redShirtHeights[i] === blueShirtHeights[i]
			) {
				return false;
			}
		}
		return true;
	} else if (redShirtHeights[0] < blueShirtHeights[0]) {
		for (let i = 0; i < blueShirtHeights.length; i++) {
			if (
				blueShirtHeights[i] < redShirtHeights[i] ||
				blueShirtHeights[i] === redShirtHeights[i]
			) {
				return false;
			}
		}
		return true;
	} else {
		return false;
	}
}

classPhotos([5, 8, 1, 3, 4], [6, 9, 2, 4, 5]); //true
classPhotos([6], [6]); //false
classPhotos([6], [5]); //true
classPhotos([6, 1], [1, 6]); //false
classPhotos([5, 6], [5, 4]); //true