/in/foo.cc: In function 'void splay(int, int&)':
/in/foo.cc:76:14: warning: suggest parentheses around comparison in operand of '^' [-Wparentheses]
    if(c[y][0]==x^c[z][0]==y)rotate(x,k);
       ~~~~~~~^~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:180:26: warning: 'tot' may be used uninitialized in this function [-Wmaybe-uninitialized]
    else val=read(),modify(k,tot,val);
                    ~~~~~~^~~~~~~~~~~
/in/foo.cc:180:26: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized]