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Figure 8: Difficulty by marginal LoC. Percentage breakdown of difficulty levels within each marginal LoC bin. As marginal LoC increases, the proportion of easy problems decreases monotonically: 93% → 88% → 85% → 81% → 79% → 50% → 13% → 0%. The difficulty cliff is sharp at 17+ marginal LoC, where hard and extreme problems become dominant.
。wps对此有专业解读
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