add MinAvgTwoSlice

Author: talgat-ruby

README.md

@@ -23,6 +23,7 @@
     -   [Lesson 5 - Prefix Sums](#s_5)
         -   [PassingCars](#s_5_passing_cars)
         -   [GenomicRangeQuery](#s_5_genomic_range_query)
+        -   [MinAvgTwoSlice](#s_5_min_avg_two_slice)
         -   [CountDiv](#s_5_count_div)
 -   [Licence](#licence)
 
@@ -214,6 +215,18 @@ https://github.com/talgat-ruby/codility-lessons-javascript/blob/master/lesson5_p
 
 https://app.codility.com/demo/results/trainingNRWKMW-CSJ/
 
+<a name="s_5_min_avg_two_slice"></a>
+
+#### MinAvgTwoSlice
+
+##### File
+
+https://github.com/talgat-ruby/codility-lessons-javascript/blob/master/lesson5_prefix_sums/MinAvgTwoSlice.js
+
+##### Link to Report
+
+https://app.codility.com/demo/results/trainingH4MVH3-G94/
+
 <a name="s_5_count_div"></a>
 
 #### CountDiv

lesson5_prefix_sums/MinAvgTwoSlice.js

@@ -0,0 +1,27 @@
+function solution(A) {
+    const len = A.length - 1;
+    let i = 0;
+    let minStart = 0;
+    let minAvg = 10001;
+
+    while (i < len) {
+        const sum1 = A[i] + A[i + 1];
+        const avg1 = sum1 / 2;
+        if (minAvg > avg1) {
+            minAvg = avg1;
+            minStart = i;
+        }
+
+        if (Number.isInteger(A[i + 2])) {
+            const avg2 = (sum1 + A[i + 2]) / 3;
+            if (minAvg > avg2) {
+                minAvg = avg2;
+                minStart = i;
+            }
+        }
+        i++;
+    }
+    return minStart;
+}
+
+module.exports = solution;

lesson5_prefix_sums/MinAvgTwoSlice.test.js

@@ -0,0 +1,10 @@
+const solution = require("./MinAvgTwoSlice");
+
+describe("test MinAvgTwoSlice", () => {
+    test("[4, 2, 2, 5, 1, 5, 8] -> 1", () => {
+        expect(solution([4, 2, 2, 5, 1, 5, 8])).toBe(1);
+    });
+    test("[5, 5, 11, 1] -> 0", () => {
+        expect(solution([5, 5, 11, 1])).toBe(0);
+    });
+});