Add pivot optimal stacking logic for large field GPP contests in app.py, improving team selection and stack data handling.

app.py

@@ -900,6 +900,20 @@ with tab1:
                                                 sub_idx = flex_file[flex_file['Player'] == qb_var].index
                                                 total_score += pulp.lpSum([player_vars[idx] for idx in sub_idx]) == 1
                                     elif contest_var1 == 'Large Field GPP':
+                                        if opto_var1 == "Pivot Optimal":
+                                            qbstack_var1 = 2
+                                            ministack_var1 = 0
+                                            dk_stacks_raw = dk_stacks_raw[dk_stacks_raw['Team'].isin(team_var1)]
+                                            dk_stacks_raw = dk_stacks_raw.sort_values(by='Median', ascending=False)
+                                            dk_stacks_raw.reset_index(drop=True)
+                                            fd_stacks_raw = fd_stacks_raw[fd_stacks_raw['Team'].isin(team_var1)]
+                                            dk_stacks_raw = dk_stacks_raw.sort_values(by='Median', ascending=False)
+                                            fd_stacks_raw.reset_index(drop=True)
+                                            dk_Max_Rank = dk_stacks_raw['Team'].values[0]
+                                            fd_Max_Rank = fd_stacks_raw['Team'].values[0]
+                                            stack_var1 = fd_Max_Rank
+                                            opp_var1 = opp_dict[stack_var1]
+                                            
                                         qbfile = flex_file[flex_file['Team'] == stack_var1]
                                         qbfile = qbfile[qbfile['Position'] == 'QB']
                                         qbfile = qbfile.reset_index()