p[' ~~'],r,a;R(x){a=p[x]?R(p[x]),p[x]=a:x;}main(b,c){for(gets(c);~scanf("%d%d%d",&r,&b,&c);!r?b-a?p[b]=a:0:puts(b-a?"NO":"YES"))R(b),b=a,R(c);}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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