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Re:高中的排列组合,插空法。。。还记得否???没想到在这里能用上。。。In Reply To:高中的排列组合,插空法。。。还记得否???没想到在这里能用上。。。 Posted by:806601756 at 2011-07-26 10:57:53 > #include <stdio.h> > #include <memory.h> > > __int64 v[50][50]; > > __int64 c(int m,int n) > { > if(n==0||m==n)return 1; > else if(n==1)return m; > else > { > if(v[m][n]==-1) > v[m][n]=c(m-1,n)+c(m-1,n-1); > return v[m][n]; > } > } > > int main() > { > int cases ,n,a,b,i,w=0; > __int64 sum=0; > scanf("%d",&cases); > while (cases--) > { > w++; > memset(v,-1,sizeof(v)); > sum=0; > scanf("%d",&n); > a=(int)((n+1)/2); > for(i=0;i<=a;i++) > { > b=n-i+1; > sum=sum+c(b,i); > } > printf("Scenario #%d:\n",w); > printf("%I64d\n",sum); > if(cases>0)printf("\n"); > } > return 0; > } Followed by: Post your reply here: |
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