catalan数 /include<cstdio> include<algorithm> usingnamespacestd; definemod1000000 intmain(){ intn,i,j,k,sum,s[1010],f; //while(scanf("%d",&n)) for(n=3;n<=20;n){ if(n0)break; for(i=1;i<=n;i) s[i]=i; sum=0; do{ f=1; for(i=1;i<=n&&f;i) for(j=i+1;j<=n&&f;...