1758
3
21
1292
0
21
621
1
20
1110
0
20
871
0
20
3486
0
20
1153
0
20
1011
1
20
412
0
20
1871
0
20
1536
0
20
2203
0
20
1011
2
19
927
0
19
2578
0
19
971
0
19
2393
0
19
1456
0
19
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Keyword(s): 数列