使用 awk，您可以使用关联数组来管理此问题，该数组的键为第 1 列，值为第 2 列的最大值:

Using awk you can manage this using an associative array that has key as column-1 and value as maximum of column-2:

awk '$2 > a[$1]{a[$1] = $2} END{for (i in a) print i, a[i]}' file

1 4
2 3
3 3
4 4