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【清华集训2016】如何优雅地求和 统计

满分提交

得分分布

Created with Raphaël 2.1.20150300450600100958575654535251550
score: 100

前缀和

Created with Raphaël 2.1.202505007501,0001009080706050403020100
score: ≤100

后缀和

Created with Raphaël 2.1.202505007501,0001009080706050403020100
score: ≥100