src/edh/prufer/seq.hpp
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|---|---|---|---|
| 1 | #pragma once | ||
| 2 | |||
| 3 | #include "../../util/alias/others/lib.hpp" | ||
| 4 | |||
| 5 | namespace tifa_libs { | ||
| 6 | |||
| 7 | //! vertex ID starts at 1 | ||
| 8 | //! tree root = n | ||
| 9 | // father ID of i is fa[i], fa[0] = 0 | ||
| 10 | 12 | CEXP vecu prufer(spnu fa) NE { | |
| 11 | 12 | cu32 n = (u32)fa.size(); | |
| 12 | 12 | vecu deg(n + 1); | |
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9511110 | flt_ (u32, i, 1, n) ++deg[fa[i]]; |
| 14 | 12 | vecu code(n); | |
| 15 |
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4756547 | for (u32 i = 1, j = 1; i <= n - 2; ++i, ++j) { |
| 16 |
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9511097 | while (deg[j]) ++j; |
| 17 | 4756535 | code[i] = fa[j]; | |
| 18 |
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9511097 | while (i <= n - 2 && !--deg[code[i]] && code[i] < j) code[i + 1] = fa[code[i]], ++i; |
| 19 | } | ||
| 20 | 12 | code.pop_back(); | |
| 21 | 12 | return code; | |
| 22 | 12 | } | |
| 23 | |||
| 24 | } // namespace tifa_libs | ||
| 25 |