[英]How can check u , v edges connect or not in DFS C++
輸入 v = 4, e = 3
邊緣 (1,2)
邊緣 (3,2)
邊緣 (3,1)
我想檢查 u = 3, v = 1
輸出:是的,我想檢查 u = 1, v = 3
輸出:沒有
有矩陣
0 1 0 0
0 0 0 0
1 1 0 0
0 0 0 0
void DFS(int i,int t)
{
int j;
visited[i] = 1;
cout << i+1 << " ";
if(i == t)
cout << "yes";
for(j=0;j<V;j++)
{
if(G[i][j]==1 && visited[j] == 0)
DFS(j,t,x);
}
}
通常,這樣的 DFS 實現可能看起來像(我還沒有測試過,所以可能有一兩個問題):
bool dfs(int this_node, int destination_node) {
// base case where this node is the destination node
if (this_node == destination_node) return true;
// mark this node as visited
visited[this_node] = true;
// go deeper in the search
for (size_t next_node = 0; next_node < V; ++ next_node) {
// skip the search if this node isn't a valid child
if (visited[next_node] || !g[this_node][next_node]) {
continue;
}
// here is the recursive step
if (dfs(next_node, destination_node)) {
return true;
}
}
// if we made it all the way here, then the search failed to reach the destination
return false;
}
然后你就可以從主 function 調用它:
if (dfs(source_node, destination_node)) {
std::cout << "yes\n";
} else {
std::cout << "no\n";
}
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