[PWGEM/Dilepton] remove unnecessary lines (#13627)

Author: dsekihat

PWGEM/Dilepton/Core/Dilepton.h

@@ -1042,13 +1042,7 @@ struct Dilepton {
     if constexpr (ev_id == 0) {
       std::pair<int, int> key_df_collision = std::make_pair(ndf, collision.globalIndex());
 
-      std::vector<int> possibleIds1;
-      std::vector<int> possibleIds2;
-
       if constexpr (pairtype == o2::aod::pwgem::dilepton::utils::pairutil::DileptonPairType::kDielectron) {
-        std::copy(t1.ambiguousElectronsIds().begin(), t1.ambiguousElectronsIds().end(), std::back_inserter(possibleIds1));
-        std::copy(t2.ambiguousElectronsIds().begin(), t2.ambiguousElectronsIds().end(), std::back_inserter(possibleIds2));
-
         if (std::find(used_trackIds_per_col.begin(), used_trackIds_per_col.end(), t1.globalIndex()) == used_trackIds_per_col.end()) {
           used_trackIds_per_col.emplace_back(t1.globalIndex());
           if (cfgDoMix) {
@@ -1070,9 +1064,6 @@ struct Dilepton {
           }
         }
       } else if (pairtype == o2::aod::pwgem::dilepton::utils::pairutil::DileptonPairType::kDimuon) {
-        std::copy(t1.ambiguousMuonsIds().begin(), t1.ambiguousMuonsIds().end(), std::back_inserter(possibleIds1));
-        std::copy(t2.ambiguousMuonsIds().begin(), t2.ambiguousMuonsIds().end(), std::back_inserter(possibleIds2));
-
         if (std::find(used_trackIds_per_col.begin(), used_trackIds_per_col.end(), t1.globalIndex()) == used_trackIds_per_col.end()) {
           used_trackIds_per_col.emplace_back(t1.globalIndex());
           if (cfgDoMix) {

PWGEM/Dilepton/Core/DileptonHadronMPC.h

@@ -1059,7 +1059,6 @@ struct DileptonHadronMPC {
 
       auto posTracks_per_coll = posTracks.sliceByCached(perCollision, collision.globalIndex(), cache);
       auto negTracks_per_coll = negTracks.sliceByCached(perCollision, collision.globalIndex(), cache);
-
       used_trackIds_per_col.reserve(posTracks_per_coll.size() + negTracks_per_coll.size());
 
       int nuls = 0, nlspp = 0, nlsmm = 0;

PWGEM/Dilepton/Utils/MCUtilities.h

@@ -513,7 +513,7 @@ int searchMothers(T& p, U& mcParticles, int pdg, bool equal)
     int quark_id = -1;
     for (int i : allmothersids) {
       auto mother = mcParticles.iteratorAt(i);
-      int mpdg = abs(mother.pdgCode());
+      int mpdg = std::abs(mother.pdgCode());
       if (mpdg == pdg && mother.pdgCode() == p.pdgCode()) { // found the quark
         if (quark_id > -1) {                                // we already found a possible candidate in the list of mothers, so now we have (at least) two
           // LOG(warning) << "Flavour tracking is ambiguous. Stopping here.";