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【清华集训2017】小 Y 和地铁 统计

满分提交

得分分布

Created with Raphaël 2.1.20501001502001009792827874645648343026161280
score: 100

前缀和

Created with Raphaël 2.1.20751502253001009080706050403020100
score: ≤100

后缀和

Created with Raphaël 2.1.20751502253001009080706050403020100
score: ≥100