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Update graph/tarjan.cc

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subcrip 2024-04-16 18:19:10 +08:00
parent c48002df20
commit f5266092a1
1 changed files with 20 additions and 1 deletions
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graph/tarjan.cc
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@ -41,4 +41,23 @@ namespace tarjan {
} }
return res; return res;
} }
vector<pair<size_t, vector<int>>> build_scc_with_size(const vector<vector<int>>& ch) {
int n = ch.size();
auto br = scc(ch);
int cnt = *max_element(br.begin(), br.end());
vector<unordered_set<int, safe_hash>> rb(cnt + 1);
for (int i = 0; i < n; ++i) {
for (auto&& u : ch[i]) {
rb[br[i]].emplace(br[u]);
}
}
vector<pair<size_t, vector<int>>> res(cnt + 1);
for (int i = 1; i <= cnt; ++i) {
res[i].second = vector<int>(rb[i].begin(), rb[i].end());
}
for (int i = 1; i <= n; ++i) {
res[br[i]].first += 1;
}
return res;
}
} }