Sum and split array like below.

Question

int arr[]={1,2,3,4,5,6,7,8,9,9,8,7,6,5,4,3,2,1,9,8,7,6,5,4,3,2,1,1,2,3,4,5,6,7,8,9}

int innergroup=3;//vary from 1,2,..n

int outergroup=9; //vary from 1,2,..n

int mplit=2; //vary from 1,2,..n

res[0]=29 //1+4+7+9+6+3

res[1]=30 //2+5+8+8+5+2

res[2]=30 //3+6+9+7+4+1

res[3]=30 //9+6+3+1+4+7

res[4]=30 //8+5+2+2+5+8

res[5]=30 //7+4+1+3+6+9 

 

res[0]=first element of inner ingroup1 of split1+first element of inner ingroup2 of split1+first element of inner ingroup3 of split1+first element of inner ingroup1 of split2+first element of inner ingroup2 of split2+first element of inner ingroup3 of split2

 

and likewise