View Compilation Error

0_0_16209606_22090.cpp: In function 'int main()':
0_0_16209606_22090.cpp:71:13: error: redeclaration of 'int flag'
         int flag=bfs(start);
             ^
0_0_16209606_22090.cpp:70:13: note: 'int flag' previously declared here
         int flag=bfs(start);
             ^