2026PKUCourseHW5：example 7 and example 8 in homework#361

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frostmoss wants to merge 2 commits intoabacusmodeling:developfrom

frostmoss:fix-buffer-issue

Commits on Mar 28, 2026

Refactor: replace fixed-size char array with std::string to prevent buffer overflow in input.cpp
frostmoss
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change the random number
frostmoss
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