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| yoo(x) | |
| prev = x | |
| while (x) | |
| if ((!x.lc && !x.rc) || x.rc == prev) | |
| prev = x | |
| x = x.parent | |
| elsif (x.lc != prev && x.rc != prev) | |
| swap(x.lc, x.rc) | |
| if (x.lc) | |
| prev = x, x = x.lc | |
| else | |
| prev = null | |
| elsif (x.lc == prev) | |
| if (x.rc) | |
| prev = x, x = x.rc | |
| else | |
| prev = null |
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