View Compilation Error

0_0_13740743_26236.cpp: In function 'void bfs(int)':
0_0_13740743_26236.cpp:16:8: error: 'ji' was not declared in this scope
     if(ji[a[x]+1]&&x==n)
        ^
0_0_13740743_26236.cpp: In function 'int main()':
0_0_13740743_26236.cpp:41:4: error: expected ',' or ';' before 'while'
    while(~scanf("%d",&n))
    ^