0_0_35942393_8736.cpp: In function 'void merge(ll, ll)':
0_0_35942393_8736.cpp:38:8: error: 'rnk' was not declared in this scope
if(rnk[x]<=rnk[y]){
^
0_0_35942393_8736.cpp:44:16: error: 'rnk' was not declared in this scope
if(x!=y && rnk[x]==rnk[y])
^
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