This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#pragma GCC optimize("O1,O2,O3,Ofast,unroll-loops")
short freq[1500]; void initialize(int n) {}; int hasEdge(int u, int v) {return u>v?++freq[u]==u:++freq[v]==v;}
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