View Compilation Error

0_0_36677618_31417.cpp: In function 'int main()':
0_0_36677618_31417.cpp:86:5: error: redeclaration of 'int flag'
 int flag=bfs(start);
     ^
0_0_36677618_31417.cpp:85:5: note: 'int flag' previously declared here
 int flag=bfs(start);
     ^