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Diffstat (limited to '')
| -rw-r--r-- | 2022/day09.awk | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/2022/day09.awk b/2022/day09.awk new file mode 100644 index 0000000..95e4fb4 --- /dev/null +++ b/2022/day09.awk @@ -0,0 +1,40 @@ +BEGIN { + t[0,0] = 1; +} +function abs(x) { + if (x < 0) return -x; + return x; +} +function step() { + rx = tx-hx; + ry = ty-hy; + if (abs(rx) <= 1 && abs(ry) <= 1) return; + if (rx == 0) { + ty += (ry < 0 ? +1 : -1); + } else if (ry == 0) { + tx += (rx < 0 ? +1 : -1); + } else { + tx += (rx < 0 ? +1 : -1); + ty += (ry < 0 ? +1 : -1); + } + t[tx,ty] = 1; +} +{ + dx = 0; + dy = 0; + if ($1 == "U") dy = -1; + if ($1 == "D") dy = +1; + if ($1 == "L") dx = -1; + if ($1 == "R") dx = +1; + for (i = 1; i <= $2; ++i) { + hx += dx; + hy += dy; + step(); + } +} +END { + for (i in t) { + sum++; + } + print sum; +} |