uploaded at 2022. 12. 31. 오후 9:16:18

programmers/우박수열 정적분/solution.java

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+// [문제 링크]: https://school.programmers.co.kr/learn/courses/30/lessons/134239
+
+import java.util.ArrayList;
+import java.util.stream.*;
+class Solution {
+    private double cal(double[] ar, int[] ra){
+        double ans = 0D;        
+        if(ra[0]>ar.length+ra[1]-1){
+            return -1;
+        }
+        for(int a = ra[0]; a < ar.length+ra[1]-1; a++) ans +=(ar[a+1]+ar[a])/2;
+        return ans;
+    }
+    public double[] solution(int y, int[][] ranges) {
+        double[] ans, answer = new double[ranges.length];
+        int i = 0;
+        double k = y;
+        ArrayList<Double> test = new ArrayList();
+        while(k>1){
+            test.add(k);
+            if(k%2==0) k = k/2;
+            else k= 3*k+1;
+            i++;
+        }
+        test.add(k);
+        ans = test.stream().mapToDouble(x -> x).toArray();
+        
+        for(int c = 0; c < ranges.length; c++){
+            answer[c] = cal(ans,ranges[c]);
+        }
+        return answer;
+    }
+}