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sclass RandomizerFromHistogram implements IF0 { LPair list; transient Random randomizer = defaultRandomizer(); *(MultiSet ms) { long sum = 0; for (A a : keys(ms)) { int val = ms.get(a); if (val == 0) continue; sum += val; list.add(pair(a, sum)); } } public A get() { if (empty(list)) null; long val = randomLong(randomizer, last(list).b); int idx = generalizedBinarySearch2(list, p -> cmp(p.b, val)); if (idx < 0) { print("idx1: " + idx); idx = -idx-1; } print("idx: " + idx); ret assertNotNull(pairA(_get(list, idx))); } }