数字金字塔 - Problem - CGOJ

Problem R: 数字金字塔

Problem R: 数字金字塔

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Time Limit : 1.000 sec Memory Limit : 128 MiB

Submit ProblemList Solved: 19 Submit Num: 42 Statistics ShowOff!

Description

1
2 3
4 5 6

7 8 9 10

请问第x行的第y个数是多少

Sample Input Copy

5 3

Sample Output Copy

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