Results for “Small algorithms & bit operations”
Small, practical examples. Search by task or narrow things down below.
Group matching values while preserving their order
C++: stable_partition keeps the relative order within both predicate groups.
C++✓ Tested
Handle a failed file open through stream state
C++: An unopened input stream is not an empty successful file read.
C++✓ Tested
Hash a file without reading it all at once
Python: Feed fixed-size binary chunks into SHA-256 for files larger than memory.
Python✓ Tested
Increment a stored value in the database
SQL: An in-database arithmetic update avoids a separate application read-modify-write step.
SQL✓ Tested
Increment a stored value in the database
SQL Server: An in-database arithmetic update avoids a separate application read-modify-write step.
SQL Server✓ Tested
Increment a stored value in the database
Postgres: An in-database arithmetic update avoids a separate application read-modify-write step.
Postgres✓ Tested
Increment a stored value in the database
SQLite: An in-database arithmetic update avoids a separate application read-modify-write step.
SQLite✓ Tested
Initialize a map entry only when absent
Java: Use computeIfAbsent when creating a collection for a new key.
Java✓ Tested
Insert only keys absent from a destination
SQL: NOT EXISTS supports a set-based missing-row insert in a single-writer example.
SQL✓ Tested
Insert only keys absent from a destination
SQL Server: NOT EXISTS supports a set-based missing-row insert in a single-writer example.
SQL Server✓ Tested
Insert only keys absent from a destination
Postgres: NOT EXISTS supports a set-based missing-row insert in a single-writer example.
Postgres✓ Tested
Insert only keys absent from a destination
SQLite: NOT EXISTS supports a set-based missing-row insert in a single-writer example.
SQLite✓ Tested