id  power   flag
0   20      0
1   25      0
2   26      1
3   30      1
4   18      0
5   30      0
6   19      0
7   21      1
8   23      0

Sum of power       flag_state
0   45 (20 +25)           0
1   56 (26 + 30)          1
2   67 (18 +30 +19)       0
3   21 (21)               1
4   23 (23)               0