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sclass LCSortedPairIndex {
  long[] pairs;
  int[] index;
  
  *(long[] *pairs, LCSortedPairIndex primer default null) {
    index = lc_sortedPairIndex(pairs, primer?.pairs);
  }
  
  int get(long pair) {
    int i = intArrayBinarySearchWithGeneralizedComparator(index,
      a -> cmp(pairs[a], pair));
    ret i >= 0 ? i : -1;
  }
}