[Add] docs for week5

Author: junnei

Diff for: docs/leet-code/week-5/1.md

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+---
+sidebar_position: 1
+---
+
+# 0039-combination-sum
+#
+[**View Problem**](https://leetcode.com/problems/combination-sum)
+
+```python 0039-combination-sum
+import random
+
+sizes = [100, 1000, 10000, 100000]
+datas = [
+    [random.randint(30, 100) for i in range(size)]
+    for size in sizes
+]
+func_name = "combinationSum"
+```

Diff for: docs/leet-code/week-5/2.md

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+---
+sidebar_position: 2
+---
+
+# 0040-combination-sum-ii
+#
+[**View Problem**](https://leetcode.com/problems/combination-sum-ii)
+
+```python 0040-combination-sum-ii
+import random
+
+elem = ["."] + [str(i) for i in range(1, 10)]
+sizes = [1]
+datas = [
+    [
+        [elem[random.randint(0, 9)] for _ in range(9)]
+        for _ in range(9)
+    ]
+]
+
+func_name = "combinationSum2"
+```

Diff for: docs/leet-code/week-5/3.md

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+---
+sidebar_position: 3
+---
+
+# 0079-word-search
+#
+[**View Problem**](https://leetcode.com/problems/word-search)
+
+```python 0079-word-search
+import random
+
+elem = ["."] + [str(i) for i in range(1, 10)]
+sizes = [1]
+datas = [
+    [
+        [elem[random.randint(0, 9)] for _ in range(9)]
+        for _ in range(9)
+    ]
+]
+
+func_name = "exist"
+```

Diff for: docs/leet-code/week-5/4.md

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+---
+sidebar_position: 4
+---
+
+# 0133-clone-graph
+#
+[**View Problem**](https://leetcode.com/problems/clone-graph)
+
+```python 0133-clone-graph
+import random
+
+elem = ["."] + [str(i) for i in range(1, 10)]
+sizes = [1]
+datas = [
+    [
+        [elem[random.randint(0, 9)] for _ in range(9)]
+        for _ in range(9)
+    ]
+]
+
+func_name = "cloneGraph"
+```

Diff for: docs/leet-code/week-5/5.md

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+---
+sidebar_position: 5
+---
+
+# 0207-course-schedule
+#
+[**View Problem**](https://leetcode.com/problems/course-schedule)
+
+```python 0207-course-schedule
+import random
+
+elem = ["."] + [str(i) for i in range(1, 10)]
+sizes = [1]
+datas = [
+    [
+        [elem[random.randint(0, 9)] for _ in range(9)]
+        for _ in range(9)
+    ]
+]
+
+func_name = "canFinish"
+```

Diff for: docs/leet-code/week-5/6.md

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+---
+sidebar_position: 6
+---
+
+# 0210-course-schedule-ii
+#
+[**View Problem**](https://leetcode.com/problems/course-schedule-ii)
+
+```python 0210-course-schedule-ii
+import random
+
+elem = ["."] + [str(i) for i in range(1, 10)]
+sizes = [1]
+datas = [
+    [
+        [elem[random.randint(0, 9)] for _ in range(9)]
+        for _ in range(9)
+    ]
+]
+
+func_name = "findOrder"
+```

Diff for: docs/leet-code/week-5/_category_.json

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+{
+  "position": 5,
+  "label": "Week 5",
+  "collapsible": true,
+  "collapsed": true
+}

Diff for: docs/leet-code/week-5/index.md

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+---
+sidebar_position: 500
+---
+
+# Week 5
+
+Week 5. Backtracking / Graphs