I don't know what happen with my code.
I alway stuck at test#5.
Could everybody give me some suggest?

This is my code :
#include<stdio.h>
#include<stdlib.h>

int main(){

int weight[20];
int stone_bag_num,i,temp,j,temp_group,group1,group2;


scanf("%d",&stone_bag_num);
/*  printf("\nstone bag : %d\n",stone_bag_num); */


/* init weight */
for (i = 0 ; i < stone_bag_num;i++){
    weight[i]=0;
}


/* input number  */
for(i = 0 ; i < stone_bag_num ; i++){
    scanf("%d",&weight[i]);
/*    printf("\nThe bag : %d  weight : %d\n",i,weight[i]); */
}

/*  put the big weigth into bag 1 */

for (i = 0 ; i < stone_bag_num ; i++ ){
     for (j= i+1 ; j < stone_bag_num ; j++ ){
           if ( weight[i] < weight[j] ){
                temp = weight[i];
                weight[i] = weight[j];
                weight[j] = temp;
           }
     }

}

/*
printf("flag");
for (i = 0 ; i < stone_bag_num ; i++ ){
     printf("The bag : %d weight : %d\n",i,weight[i]);
}
*/


/* calcate the mid */
group1=0,group2=0;
for (i = 0 ; i < stone_bag_num ; i++ ){
    temp_group = (   (   group1+group2   ) /2   );
    if(     (group1 - temp_group)  >  (group2 - temp_group)   ){
             group2=group2+weight[i];
    }
    else
             group1=group1+weight[i];

}

/* printf("group1 : %d  group2 : %d",group1,group2); */

if(  (group1 - group2) > 0){
      printf("%d",abs(group1 - group2)  );
}
else{
      printf("%d",abs(group2 - group1)  );
}
exit(0);
/*return 0;*/

}