= 偶数求和 =
http://acm.hdu.edu.cn/showproblem.php?pid=2015

{{{#!cplusplus
/*written by czk*/
#include <stdio.h>
#include <math.h>

int main() {
    int n, m, i;
    while(scanf("%d%d", &n, &m)!=EOF)
        for(i = 2; i <= 2*n; i+= 2*m)
            if(2*n-i <= 2*(m-1))
                printf("%d\n", n+i/2);
            else
                printf("%d ", i+m-1);
}
}}}