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    就硬生生壓行

    Posted by njtech1921147136 at 2020-10-09 15:55:13 on Problem 2553
    (0)  


    #include<cstdio>
    int n,ans[11] = { 0, 1, 0, 0, 2, 10, 4, 40, 92, 352, 724 };
    int main(){
    	while (scanf_s("%d", &n), n) printf("%d\n", ans[n]);
    	return 0;
    }

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