taoc4b - aoc22 - advent of code 2022 solutions
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       ---
       taoc4b (186B)
       ---
            1 #!/bin/awk -f
            2 BEGIN{ FS="," }
            3 {
            4         if (split($1, a, "-") != 2 || split($2, b, "-") != 2)
            5                 printf("split error: %s\n", $0)
            6         if (a[1] <= b[2] && b[1] <= a[2])
            7             sum++
            8 }
            9 END{ print sum }