0_0_38510464_31453.cpp: In function 'int bfs(int, int)':
0_0_38510464_31453.cpp:45:5: error: redefinition of 'int bfs(int, int)'
int bfs(int n,int k)
^
0_0_38510464_31453.cpp:12:5: note: 'int bfs(int, int)' previously defined here
int bfs(int n,int k){
^
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