/in/foo.cc: In function 'int BFS(int, int)':
/in/foo.cc:28:18: warning: array subscript has type 'char' [-Wchar-subscripts]
        if(x!=px[c])
                  ^
/in/foo.cc:29:18: warning: array subscript has type 'char' [-Wchar-subscripts]
            x=px[c],y=py[c];
                  ^
/in/foo.cc:29:26: warning: array subscript has type 'char' [-Wchar-subscripts]
            x=px[c],y=py[c];
                          ^
/in/foo.cc:31:18: warning: array subscript has type 'char' [-Wchar-subscripts]
            x=qx[c],y=qy[c];
                  ^
/in/foo.cc:31:26: warning: array subscript has type 'char' [-Wchar-subscripts]
            x=qx[c],y=qy[c];
                          ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:53:21: warning: array subscript has type 'char' [-Wchar-subscripts]
        if(px[a[i][j]]==0)
                     ^
/in/foo.cc:54:22: warning: array subscript has type 'char' [-Wchar-subscripts]
            px[a[i][j]]=i,py[a[i][j]]=j;
                      ^
/in/foo.cc:54:36: warning: array subscript has type 'char' [-Wchar-subscripts]
            px[a[i][j]]=i,py[a[i][j]]=j;
                                    ^
/in/foo.cc:56:22: warning: array subscript has type 'char' [-Wchar-subscripts]
            qx[a[i][j]]=i,qy[a[i][j]]=j;
                      ^
/in/foo.cc:56:36: warning: array subscript has type 'char' [-Wchar-subscripts]
            qx[a[i][j]]=i,qy[a[i][j]]=j;
                                    ^

FileNotFoundError('input/17.in',)