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用组合数学数公式Pk(n+k)怎么会错呢!!不懂??#include<stdio.h> double a[1001][1001]; int main() { int i,j,n,m,k,b; double sum; for(i=1;i<=1000;i++) { for(j=1;j<=100;j++) { if((i==j)||(j==1)){a[i][j]=1;continue;} if(i>j) { for(b=1;b<=j;b++) a[i][j]+=a[i-j][b]; } if(i<j)a[i][j]=0; } } scanf("%d%d",&n,&k); sum=0; for(i=1;i<=k;i++) sum+=a[n][i]; printf("%.0lf\n",sum); //while(1); } Followed by:
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