_1184.java

package com.fishercoder.solutions;

/**
 * 1184. Distance Between Bus Stops
 *
 * A bus has n stops numbered from 0 to n - 1 that form a circle. We know the distance between all pairs of neighboring stops where distance[i] is the distance between the stops number i and (i + 1) % n.
 * The bus goes along both directions i.e. clockwise and counterclockwise.
 * Return the shortest distance between the given start and destination stops.
 *
 * Example 1:
 * Input: distance = [1,2,3,4], start = 0, destination = 1
 * Output: 1
 * Explanation: Distance between 0 and 1 is 1 or 9, minimum is 1.
 *
 * Example 2:
 * Input: distance = [1,2,3,4], start = 0, destination = 2
 * Output: 3
 * Explanation: Distance between 0 and 2 is 3 or 7, minimum is 3.
 *
 * Example 3:
 * Input: distance = [1,2,3,4], start = 0, destination = 3
 * Output: 4
 * Explanation: Distance between 0 and 3 is 6 or 4, minimum is 4.
 *
 * Constraints:
 * 1 <= n <= 10^4
 * distance.length == n
 * 0 <= start, destination < n
 * 0 <= distance[i] <= 10^4
 * */
public class _1184 {
    public static class Solution1 {
        public int distanceBetweenBusStops(int[] distance, int start, int destination) {
            if (start > destination) {
                int tmp = start;
                start = destination;
                destination = tmp;
            }
            int clockwise = 0;
            for (int i = start; i < destination; i++) {
                clockwise += distance[i];
            }
            int counterClockwise = 0;
            for (int i = destination; i < distance.length; i++) {
                counterClockwise += distance[i];
            }
            for (int i = 0; i < start; i++) {
                counterClockwise += distance[i];
            }

            return Math.min(clockwise, counterClockwise);
        }
    }
}