区间加法

/*
 * 解题思路：
 * 1. 初始化一个长度为n的零数组。
 * 2. 使用流处理每一个操作，对于每一个操作，从start到end的所有元素都加上inc。
 * 3. 返回最终的数组。
 */
 
import java.util.Arrays;
 
public class IntervalAdditionStream {
    public static int[] applyOperations(int n, int[][] operations) {
        int[] result = new int[n];
        Arrays.stream(operations).forEach(operation -> {
            int start = operation[0];
            int end = operation[1];
            int inc = operation[2];
            for (int i = start; i <= end; i++) {
                result[i] += inc;
            }
        });
        return result;
    }
 
    public static void main(String[] args) {
        int n = 5;
        int[][] operations = {{1, 3, 2}, {2, 4, 3}, {0, 2, -2}};
        int[] result = applyOperations(n, operations);
        Arrays.stream(result).forEach(num -> System.out.print(num + " "));
    }
}