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- #include <iostream>
- #include <fstream>
- using namespace std;
- ifstream f("BFS.in");
- ofstream g("BFS.out");
- int n,m,x,a[101][101],v[101],s,t,i;
- void bfs(int start)
- {
- int x[101],k,st,dr;
- st=dr=1;
- x[1]=start;
- v[start]=1;
- g<<start<<" ";
- while(st<=dr)
- {
- k=x[st];
- for(i=1;i<=n;i++)
- if(v[i]==0 && a[k][i]==1)
- {
- v[i]=1;
- x[++dr]=i;
- g<<i<<" ";
- }
- st++;
- }
- }
- int main()
- {
- f>>n>>m>>x;
- for(i=1;i<=m;i++)
- {
- f>>s>>t;
- a[s][t]=1;
- a[t][s]=1;
- }
- bfs(x);
- return 0;
- }
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