Split and sum array like below

Question

arr[]={1,3,2,4,6,7,8,9,10, 11,12,16,5,8,7,8,4,6};

split=2; // the arr[] will be divide in 2(no of splits) parts each with equal elements  split=1,2,3...n

skip=2; // skip is no of element to be skipped. skip=1,2,3...n

size of res[] should be accordingly.

then

res[0]=15 //1+4+8

res[1]=18//3+6+9

res[2]=19 //2+7+10

res[3]=24 //11+5+8

res[4]= 24 //12+8+4

res[5]= 29//16+7+6 

and like wise split can be 1 to n.

arr[]={1,2,3...n} elements

This should be dynamically.

Please help me to do this.

Thanks