HDU 2015 -- 偶数求和

#include<stdio.h>
int main(){
int n,m;
int a[110];
a[0]=2;
for(int i=1;i<=100;i++)
a[i]=a[i-1]+2;
while(~scanf("%d%d",&n,&m)){
int i,j,k,sum=0;
if(n<m){
for(k=0;k<n;k++)
sum+=a[k];
printf("%d\n",sum/n);
continue;
}
for(k=0;k<m;k++)
sum+=a[k];
printf("%d",sum/m);
j=k;
for(i=m;i<n;i+=m){
sum=0;
if(i+m>n) break;
for(j=i;j<i+m;j++)
sum+=a[j];
printf(" %d",sum/m);
}
if(j<n){
sum=0;
for(int k=j;k<n;k++)
sum+=a[k];
printf(" %d",sum/(n-j));
}
printf("\n");
}
}