/in/foo.cc: In function 'int BFS(int, int)':
/in/foo.cc:29:18: warning: array subscript has type 'char' [-Wchar-subscripts]
        if(x!=px[c])
                  ^
/in/foo.cc:30:18: warning: array subscript has type 'char' [-Wchar-subscripts]
            x=px[c],y=py[c];
                  ^
/in/foo.cc:30:26: warning: array subscript has type 'char' [-Wchar-subscripts]
            x=px[c],y=py[c];
                          ^
/in/foo.cc:32:18: warning: array subscript has type 'char' [-Wchar-subscripts]
            x=qx[c],y=qy[c];
                  ^
/in/foo.cc:32:26: warning: array subscript has type 'char' [-Wchar-subscripts]
            x=qx[c],y=qy[c];
                          ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:68:16: warning: array subscript has type 'char' [-Wchar-subscripts]
        if(px[ch]==0)
                ^
/in/foo.cc:69:17: warning: array subscript has type 'char' [-Wchar-subscripts]
            px[ch]=i,py[ch]=j;
                 ^
/in/foo.cc:69:26: warning: array subscript has type 'char' [-Wchar-subscripts]
            px[ch]=i,py[ch]=j;
                          ^
/in/foo.cc:71:17: warning: array subscript has type 'char' [-Wchar-subscripts]
            qx[ch]=i,qy[ch]=j;
                 ^
/in/foo.cc:71:26: warning: array subscript has type 'char' [-Wchar-subscripts]
            qx[ch]=i,qy[ch]=j;
                          ^

FileNotFoundError('input/17.in',)