taoc4 - aoc22 - advent of code 2022 solutions
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       ---
       taoc4 (227B)
       ---
            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[1] && a[2] <= b[2]) ||
            7             (a[1] <= b[1] && a[2] >= b[2]))
            8             sum++
            9 }
           10 END{ print sum }