test/cpv/aizu-grl/grl_5_c.cpp
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|---|---|---|---|
| 1 | // competitive-verifier: PROBLEM https://onlinejudge.u-aizu.ac.jp/courses/library/5/GRL/all/GRL_5_C | ||
| 2 | #include "../../../src/graph/ds/alist/lib.hpp" | ||
| 3 | #include "../../../src/tree/ds/lib.hpp" | ||
| 4 | #include "../../../src/tree/lca_hld/lib.hpp" | ||
| 5 | |||
| 6 | using namespace tifa_libs; | ||
| 7 | 32 | int main() { | |
| 8 |
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32 | std::cin.tie(nullptr)->std::ios::sync_with_stdio(false); |
| 9 | u32 n; | ||
| 10 |
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32 | std::cin >> n; |
| 11 | 32 | tree<alist<>> tr(n); | |
| 12 |
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779054 | for (u32 i = 0, k; i < n; ++i) { |
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779022 | std::cin >> k; |
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1558012 | for (u32 j = 0, x; j < k; ++j) { |
| 15 |
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778990 | std::cin >> x; |
| 16 | 778990 | tr.add_arc(i, x), tr.add_arc(x, i); | |
| 17 | } | ||
| 18 | } | ||
| 19 |
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32 | lca_hld lca(tr); |
| 20 | u32 q; | ||
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32 | std::cin >> q; |
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818806 | for (u32 i = 0, u, v; i < q; ++i) { |
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818774 | std::cin >> u >> v; |
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818774 | std::cout << lca(u, v) << '\n'; |
| 25 | } | ||
| 26 | 32 | return 0; | |
| 27 | 32 | } | |
| 28 |