From 130de11d866f7d742e7a1ecc18fbd4155d2d74cd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=9D=9A=E6=8C=81?= <2352009235@qq.com>
Date: Tue, 6 Jul 2021 09:20:37 +0000
Subject: [PATCH] update
 EducationSystem/entry/src/main/java/com/huawei/codelab/slice/PictureGameAbilitySlice.java.

---
 .../slice/PictureGameAbilitySlice.java        | 34 +++++++++++++++++--
 1 file changed, 31 insertions(+), 3 deletions(-)

diff --git a/EducationSystem/entry/src/main/java/com/huawei/codelab/slice/PictureGameAbilitySlice.java b/EducationSystem/entry/src/main/java/com/huawei/codelab/slice/PictureGameAbilitySlice.java
index 54b2b4d8..a8bbfbc8 100644
--- a/EducationSystem/entry/src/main/java/com/huawei/codelab/slice/PictureGameAbilitySlice.java
+++ b/EducationSystem/entry/src/main/java/com/huawei/codelab/slice/PictureGameAbilitySlice.java
@@ -63,6 +63,8 @@ import java.util.List;
 public class PictureGameAbilitySlice extends AbilitySlice {
     private static final String TAG = CommonData.TAG + PictureGameAbilitySlice.class.getSimpleName();
 
+    private static final int DIVIDED_NUM2 = 2;
+
     private static final int PERMISSION_CODE = 20201203;
 
     private static final int DELAY_TIME = 10;
@@ -452,10 +454,36 @@ public class PictureGameAbilitySlice extends AbilitySlice {
             imageIndexs[rand1] = imageIndexs[rand2];
             imageIndexs[rand2] = imageTemp;
         }
-        for (int i = 0; i < imageCount; i++) {
-            imagePositions[i].setPixelMap(images[imageIndexs[i]]);
+
+        if (inverseNumber(imageIndexs) % DIVIDED_NUM2 == 0) {
+            for (int i = 0; i < imageCount; i++) {
+                imagePositions[i].setPixelMap(images[imageIndexs[i]]);
+            }
+            LogUtil.info(TAG, "pictureRandom end");
+        } else {
+            LogUtil.info(TAG, "pictureRandom failed");
+            pictureRandom();
+        }
+    }
+
+    /**
+     * 计算逆序数，保证游戏有解
+     *
+     * @param imageArray int[]
+     * @return int
+     */
+    private int inverseNumber(int[] imageArray) {
+        int count = 0;
+        for (int i = 0; i <= imageArray.length - 1; i++) {
+            for (int j = i + 1; j <= imageArray.length - 1; j++) {
+                int a = imageArray[i];
+                int b = imageArray[j];
+                if (a > b) {
+                    count++;
+                }
+            }
         }
-        LogUtil.info(TAG, "pictureRandom end");
+        return count;
     }
 
     /**
-- 
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