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Diffstat (limited to 'sonstiges/2sat.cpp')
| -rw-r--r-- | sonstiges/2sat.cpp | 63 |
1 files changed, 0 insertions, 63 deletions
diff --git a/sonstiges/2sat.cpp b/sonstiges/2sat.cpp deleted file mode 100644 index 627e484..0000000 --- a/sonstiges/2sat.cpp +++ /dev/null @@ -1,63 +0,0 @@ -vector< vector<int> > adjlist; //adjazenzliste -vector<int> sccs; //speichert die gefundenen SCCs -vector<bool> visited; //welcher Knoten ist schon besucht worden (in der DFS) -vector<bool> inStack; //ist Knoten gerade im Stack -vector<int> d; //discovery time -vector<int> low; //wie weit hoch geht's im Tiefensuchbaum -int counter; //Zaehler fuer discovery time -stack<int> st; //der Stack -int sccCounter; //Zaehler fuer SCCs - -//Tiefensuche, die starke Zusammenhangskomponenten findet -void visit(int v) { - visited[v] = true; - d[v] = counter; - low[v] = counter; - counter++; - st.push(v); - inStack[v] = true; - - for (int i = 0; i < (int)adjlist[v].size(); i++) { - int w = adjlist[v][i]; - - if (!visited[w]) { - visit(w); - low[v] = min(low[v], low[w]); - } else if (inStack[w]) { - low[v] = min(low[v], low[w]); - } - } - - if (low[v] == d[v]) { - int next; - do { - next = st.top(); - st.pop(); - sccs[next] = sccCounter; - inStack[next] = false; - } while (next != v); - - sccCounter++; - } -} - -void solve() { - //adjlist initialisieren - //(a || b) wird zu (!a => b) und (!b => a) - - visited.clear(); visited.assign(adjlist.size(), false); - inStack.clear(); inStack.assign(adjlist.size(), false); - d.clear(); d.assign(adjlist.size(), false); - low.clear(); low.assign(adjlist.size(), false); - sccs.clear(); sccs.resize(adjlist.size()); - - counter = 0; - sccCounter = 0; - for (i = 0; i < (int)adjlist.size(); i++) { - if (!visited[i]) { - visit(i); - sccCounter++; - } - } - // genau dann loesbar, wenn keine Variable in gleicher SCC wie Negation ist -}
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