#1406. 打印杨辉三角
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ID: 1406
Type: Default
1000ms
128MiB
Tried: 1
Accepted: 1
Difficulty: 10
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打印杨辉三角
说明
输入一个整数n （0<=n<=20) ，输出n行的杨辉三角。
【输入样例】
8
【输出样例】
1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
1 5 10 10 5 1
1 6 15 20 15 6 1
1 7 21 35 35 21 7 1
样例
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