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A realistic smartphone photo of an open lined notebook page resting on a medium-brown wooden desk, capturing a handwritten computer science data structures homework assignment submitted for class. Shot from directly above at a slight angle in a 3:4 vertical framing, with realistic phone-camera perspective, mild paper curvature, and soft warm indoor desk lighting casting subtle shadows.

The off-white notebook paper has pale gray horizontal ruled lines, rounded corners, and a glimpse of the previous page along the left edge. Resting beside the notebook on the right is a black transparent-barrel gel pen near the bottom edge, and a small white eraser with gray graphite smudges and a few tiny eraser shavings near the top right corner.

The content is handwritten in believable, slightly casual black gel pen Chinese characters, math symbols, and C-style pseudocode with natural spacing, imperfect alignment with the ruled lines, and occasional slant variation:

Centered at the top as the header: "[第五章答案]"

Section 1:
"1. (1) 叶结点数 = (k-1)m + 1。"
"(2) 最多结点数 = (k^h - 1)/(k - 1)，最少结点数 = k(h-1)+1。"

Section 2:
"2. WPL：遍历二叉树，遇到叶子就加 weight × depth，"
"根深度为 0。"
"代码大意:"
Indented beneath:
"if(root == NULL) return 0;"
"if(!root->left && !root->right)"
"return root->weight * depth;"
"return WPL(root->left, depth+1) +"
"WPL(root->right, depth+1);"

Section 3:
"3. 二叉树根为 A，左子树 B-D-E-H,"
"右子树 C-F，其中 F下有 I、G，I下有 M,"
"M下有 K，G下有 J，J下有 L。"
"森林按左孩子右兄弟关系转换即可。"

Style: Natural amateur smartphone snapshot, photorealistic desk setting, authentic student handwriting, no digital fonts, no stamps, no watermarks.

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