Fix linter errors

Author: Marcellocosti

PWGHF/Core/DecayChannels.h

@@ -24,6 +24,7 @@
 #include <array>
 #include <cstdint>
 #include <unordered_map>
+#include <vector>
 
 using namespace o2::constants::physics;
 

PWGHF/TableProducer/candidateCreator2Prong.cxx

@@ -795,7 +795,7 @@ struct HfCandidateCreator2ProngExpressions {
               auto motherParticle = mcParticles.rawIteratorAt(indexRec);
               std::array<int, 3> finalStateParts2ProngAll = std::array{finalState[0], finalState[1], finalState[2]};
               if (motherParticle.pdgCode() < 0) {
-                for (auto& part : finalStateParts2ProngAll) {
+                for (const auto& part : finalStateParts2ProngAll) {
                   if (part == kPi0) {
                     part = -part; // The Pi0 pdg code does not change between particle and antiparticle
                   }

PWGHF/TableProducer/candidateCreator3Prong.cxx

@@ -973,7 +973,7 @@ struct HfCandidateCreator3ProngExpressions {
                 if (finalState.size() == 4) { // Check if the final state has 4 particles
                   std::array<int, 4> finalStateParts3ProngAll = std::array{finalState[0], finalState[1], finalState[2], finalState[3]};
                   if (sign < 0) {
-                    for (auto& part : finalStateParts3ProngAll) {
+                    for (const auto& part : finalStateParts3ProngAll) {
                       if (part == kPi0) {
                         part = -part; // The Pi0 pdg code does not change between particle and antiparticle
                       }
@@ -985,7 +985,7 @@ struct HfCandidateCreator3ProngExpressions {
                 } else if (finalState.size() == 5) { // Check if the final state has 5 particles
                   std::array<int, 5> finalStateParts3ProngAll = std::array{finalState[0], finalState[1], finalState[2], finalState[3], finalState[4]};
                   if (sign < 0) {
-                    for (auto& part : finalStateParts3ProngAll) {
+                    for (const auto& part : finalStateParts3ProngAll) {
                       if (part == kPi0) {
                         part = -part; // The Pi0 pdg code does not change between particle and antiparticle
                       }

PWGHF/Utils/utilsMcGen.h

@@ -64,14 +64,14 @@ void fillMcMatchGen2Prong(T const& mcParticles, U const& mcParticlesPerMcColl, V
         if (finalState.size() == 3) {                     // Partly Reco 3-prong decays
           std::array<int, 3> finalStateParts = std::array{finalState[0], finalState[1], finalState[2]};
           if (particle.pdgCode() < 0) {
-            for (auto& part : finalStateParts) {
+            for (const auto& part : finalStateParts) {
               if (part == kPi0) {
                 part = -part; // The Pi0 pdg code does not change between particle and antiparticle
               }
             }
           }
           matched = RecoDecay::isMatchedMCGen(mcParticles, particle, Pdg::kD0, finalStateParts, true, &sign, maxDepth);
-        } else if (finalState.size() == 2) {              // Fully Reco 3-prong decays
+        } else if (finalState.size() == 2) {              // Fully Reco 2-prong decays
           std::array<int, 2> finalStateParts = std::array{finalState[0], finalState[1]};
           matched = RecoDecay::isMatchedMCGen(mcParticles, particle, Pdg::kD0, finalStateParts, true, &sign, maxDepth);
         } else {
@@ -173,7 +173,7 @@ void fillMcMatchGen3Prong(T const& mcParticles, U const& mcParticlesPerMcColl, V
           if (finalState.size() == 5) {                     // Partly Reco 3-prong decays
             std::array<int, 5> finalStateParts = std::array{finalState[0], finalState[1], finalState[2], finalState[3], finalState[4]};
             if (particle.pdgCode() < 0) {
-              for (auto& part : finalStateParts) {
+              for (const auto& part : finalStateParts) {
                 if (part == kPi0) {
                   part = -part; // The Pi0 pdg code does not change between particle and antiparticle
                 }
@@ -184,7 +184,7 @@ void fillMcMatchGen3Prong(T const& mcParticles, U const& mcParticlesPerMcColl, V
           } else if (finalState.size() == 4) {                     // Partly Reco 3-prong decays
             std::array<int, 4> finalStateParts = std::array{finalState[0], finalState[1], finalState[2], finalState[3]};
             if (particle.pdgCode() < 0) {
-              for (auto& part : finalStateParts) {
+              for (const auto& part : finalStateParts) {
                 if (part == kPi0) {
                   part = -part; // The Pi0 pdg code does not change between particle and antiparticle
                 }