commit

Author: 王俊超

Diff for: .idea/modules.xml

@@ -0,0 +1,34 @@
+/**
+ * @author: wangjunchao(王俊超)
+ * @time: 2018-10-12 13:53
+ **/
+public class NumArray {
+    private int[] nums;
+
+    public NumArray(int[] nums) {
+        this.nums = nums;
+    }
+
+    public int sumRange(int i, int j) {
+
+        if (i > j) {
+            throw new IllegalArgumentException("i = " + i + ", j = " + j +", i must not greater than j");
+        }
+
+        if (j < 0) {
+            throw new IllegalArgumentException("i = " + i + ", j = " + j +", i must not less than 0");
+        }
+
+        i = i < 0 ? 0 : i;
+        j = j >= nums.length ? nums.length - 1 : j;
+
+        int sum = 0;
+
+
+        for (int k = i; k <= j; k++) {
+            sum += nums[k];
+        }
+
+        return sum;
+    }
+}

Diff for: 【303】【Range Sum Query - Immutable】/src/NumArray.java

@@ -0,0 +1,12 @@
+/**
+ * @author: wangjunchao(王俊超)
+ * @time: 2018-10-12 14:17
+ **/
+public class Test {
+    public static void main(String[] args) {
+        NumArray array = new NumArray(new int[]{-2, 0, 3, -5, 2, -1});
+        System.out.println(array.sumRange(0, 2));
+        System.out.println(array.sumRange(2, 5));
+        System.out.println(array.sumRange(0, 5));
+    }
+}