Day 2: checksum
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21cab6c757
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4
.gitignore
vendored
4
.gitignore
vendored
@ -14,4 +14,6 @@
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# Project-local glide cache, RE: https://github.com/Masterminds/glide/issues/736
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.glide/
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01dec/01dec
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??dec/??dec
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*~
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*.swp
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33
02dec/checksum.go
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33
02dec/checksum.go
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@ -0,0 +1,33 @@
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package main
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import (
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"bufio"
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"fmt"
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"math"
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"os"
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"strconv"
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"strings"
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)
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func main() {
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var sum int
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in := bufio.NewScanner(os.Stdin)
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for in.Scan() {
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sum += diff(in.Text())
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}
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fmt.Println(sum)
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}
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func diff(l string) int {
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min, max := math.MaxInt64, 0
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for _, s := range strings.Split(l, "\t") {
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i, _ := strconv.Atoi(s)
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if min >= i {
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min = i
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}
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if max <= i {
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max = i
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}
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}
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return max - min
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}
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16
02dec/input
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16
02dec/input
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@ -0,0 +1,16 @@
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3093 749 3469 142 2049 3537 1596 3035 2424 3982 3290 125 249 131 118 3138
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141 677 2705 2404 2887 2860 1123 2714 117 1157 2607 1800 153 130 1794 3272
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182 93 2180 114 103 1017 95 580 2179 2470 2487 2806 1574 1325 1898 1706
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3753 233 3961 3747 3479 3597 1303 2612 4043 1815 3318 737 197 3943 239 254
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113 147 961 157 3514 3045 1270 3528 1369 3377 492 156 1410 3251 1839 1249
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3948 3651 888 3631 253 220 4266 1284 3595 237 2138 3799 2319 254 267 1182
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399 446 795 653 154 762 140 487 750 457 730 150 175 841 323 492
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999 979 103 99 1544 1404 100 1615 840 92 1552 1665 1686 76 113 1700
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4049 182 3583 1712 200 3326 3944 715 213 1855 2990 3621 2560 842 249 2082
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2610 4749 2723 2915 2189 3911 124 164 1895 3095 3992 134 127 4229 3453 4428
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105 692 101 150 193 755 84 185 622 851 706 251 86 408 774 831
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238 217 224 1409 1850 2604 363 265 596 2933 2641 2277 803 2557 1399 237
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304 247 192 4369 997 5750 85 1248 4718 3888 5228 5116 5880 5348 6052 245
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238 373 228 395 86 59 289 87 437 384 233 79 470 403 441 352
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151 3473 1435 87 1517 1480 140 2353 1293 118 163 3321 2537 3061 1532 3402
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127 375 330 257 220 295 145 335 304 165 151 141 289 256 195 272
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