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// finds highest index where predicate is true. // returns from-1 when predicate is false on whole range. // Predicate operates on a range and returns true // iff any value in the range is contained in the set. static int lastIndexOfRangePredicate(int from default 0, int to, IF2 pred) { // interval empty? if (from >= to) ret from-1; // predicate false on whole range? if (!pred.get(from, to)) ret from-1; while ping (to-from > 1) { // predicate is true somewhere in range. split in middle. int mid = (from + to) >>> 1; // check higher half if (mid < to && pred.get(mid, to)) { // predicate is true in higher half. move there, continue. // if higher half is only one element, we're done if (mid+1 == to) ret mid; from = mid; continue; } // higher half is clean, move to lower half to = mid; } // we've narrowed things down to at most one element, return index ret to-1; }