foo.cc: In function ‘void splay(int, int&)’:
foo.cc:66:24: warning: suggest parentheses around comparison in operand of ‘^’ [-Wparentheses]
   66 |             if (c[z][0]==y ^ c[y][0]==x)rotate(x,k);
      |                 ~~~~~~~^~~
In function ‘int split(int, int)’,
    inlined from ‘void modify(int, int, int)’ at foo.cc:107:17,
    inlined from ‘int main()’ at foo.cc:183:35:
foo.cc:95:34: warning: ‘k’ may be used uninitialized [-Wmaybe-uninitialized]
   95 |     rint x=find(rt,k),y=find(rt,k+tot+1);
      |                                 ~^~~~
foo.cc: In function ‘int main()’:
foo.cc:175:10: note: ‘k’ was declared here
  175 |     rint k,tot,val;char ch[10];
      |          ^
In function ‘int split(int, int)’,
    inlined from ‘void modify(int, int, int)’ at foo.cc:107:17,
    inlined from ‘int main()’ at foo.cc:183:35:
foo.cc:95:34: warning: ‘tot’ may be used uninitialized [-Wmaybe-uninitialized]
   95 |     rint x=find(rt,k),y=find(rt,k+tot+1);
      |                                 ~^~~~
foo.cc: In function ‘int main()’:
foo.cc:175:12: note: ‘tot’ was declared here
  175 |     rint k,tot,val;char ch[10];
      |            ^~~

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