[PWGCF] EbyE finalized errors on moments using subsampling

[baasingh]

No description provided.

[github-actions]

O2 linter results: ❌ 0 errors, ⚠️ 2 warnings, 🔕 0 disabled

[alibuild]

Error while checking build/O2Physics/code-check for 4299406 at 2026-07-11 08:40:

## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'Found 13 errors and 6 warnings.'
Found 13 errors and 6 warnings.
++ [[ 13 -gt 0 ]]
++ cat /sw/BUILD/00a6e6e3048522fa3654cda503a0d16a36a2a6e7/O2Physics-code-check/errors.txt
PWGCF/EbyEFluctuations/Tasks/FactorialMomentsTask.cxx:56:1: error: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays,-warnings-as-errors]
PWGCF/EbyEFluctuations/Tasks/FactorialMomentsTask.cxx:56:7: error: variable 'tmpFqErr' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGCF/EbyEFluctuations/Tasks/FactorialMomentsTask.cxx:57:7: error: variable 'collisionZ' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables,-warnings-as-errors]
PWGCF/EbyEFluctuations/Tasks/FactorialMomentsTask.cxx:58:8: error: constructor does not initialize these fields: pdg, binningM, fqEvent, fqEventSampled, binConEvent, binConEventSampled [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
PWGCF/EbyEFluctuations/Tasks/FactorialMomentsTask.cxx:170:16: error: member 'dcaxyMaxTrackPar0' of type 'const double' is const qualified [cppcoreguidelines-avoid-const-or-ref-data-members,-warnings-as-errors]
PWGCF/EbyEFluctuations/Tasks/FactorialMomentsTask.cxx:171:16: error: member 'dcaxyMaxTrackPar1' of type 'const double' is const qualified [cppcoreguidelines-avoid-const-or-ref-data-members,-warnings-as-errors]
PWGCF/EbyEFluctuations/Tasks/FactorialMomentsTask.cxx:172:16: error: member 'dcaxyMaxTrackPar2' of type 'const double' is const qualified [cppcoreguidelines-avoid-const-or-ref-data-members,-warnings-as-errors]
PWGCF/EbyEFluctuations/Tasks/FactorialMomentsTask.cxx:173:16: error: member 'dcazMaxTrack' of type 'const double' is const qualified [cppcoreguidelines-avoid-const-or-ref-data-members,-warnings-as-errors]
PWGCF/EbyEFluctuations/Tasks/FactorialMomentsTask.cxx:206:5: error: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays,-warnings-as-errors]
PWGCF/EbyEFluctuations/Tasks/FactorialMomentsTask.cxx:289:9: error: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays,-warnings-as-errors]
PWGCF/EbyEFluctuations/Tasks/FactorialMomentsTask.cxx:299:42: error: narrowing conversion from 'double' to 'Int_t' (aka 'int') [bugprone-narrowing-conversions,-warnings-as-errors]
PWGCF/EbyEFluctuations/Tasks/FactorialMomentsTask.cxx:299:73: error: narrowing conversion from 'double' to 'Int_t' (aka 'int') [bugprone-narrowing-conversions,-warnings-as-errors]
PWGCF/EbyEFluctuations/Tasks/FactorialMomentsTask.cxx:544:10: error: implicit conversion 'unsigned long long' -> 'bool' [readability-implicit-bool-conversion,-warnings-as-errors]
++ [[ 6 -gt 0 ]]
++ cat /sw/BUILD/00a6e6e3048522fa3654cda503a0d16a36a2a6e7/O2Physics-code-check/warnings.txt
PWGCF/EbyEFluctuations/Tasks/FactorialMomentsTask.cxx:390:37: warning: statement should be inside braces [readability-braces-around-statements]
PWGCF/EbyEFluctuations/Tasks/FactorialMomentsTask.cxx:392:37: warning: statement should be inside braces [readability-braces-around-statements]
PWGCF/EbyEFluctuations/Tasks/FactorialMomentsTask.cxx:394:47: warning: statement should be inside braces [readability-braces-around-statements]
PWGCF/EbyEFluctuations/Tasks/FactorialMomentsTask.cxx:470:37: warning: statement should be inside braces [readability-braces-around-statements]
PWGCF/EbyEFluctuations/Tasks/FactorialMomentsTask.cxx:472:37: warning: statement should be inside braces [readability-braces-around-statements]
PWGCF/EbyEFluctuations/Tasks/FactorialMomentsTask.cxx:474:47: warning: statement should be inside braces [readability-braces-around-statements]
++ [[ 13 -gt 0 ]]
++ exit 1
--

Full log here.