day 10 part 1

day10/input

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+35
+111
+135
+32
+150
+5
+106
+154
+41
+7
+27
+117
+109
+63
+64
+21
+138
+98
+40
+71
+144
+13
+66
+48
+12
+55
+119
+103
+54
+78
+65
+112
+39
+128
+53
+140
+77
+34
+28
+81
+151
+125
+85
+124
+2
+99
+131
+59
+60
+6
+94
+33
+42
+93
+14
+141
+92
+38
+104
+9
+29
+100
+52
+19
+147
+49
+74
+70
+84
+113
+120
+91
+97
+17
+45
+139
+90
+116
+149
+129
+87
+69
+20
+24
+148
+18
+58
+123
+76
+118
+130
+132
+75
+110
+105
+1
+8
+86

day10/main.go

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+package main
+
+import (
+    "fmt"
+    "sort"
+    "strconv"
+    "strings"
+    "io/ioutil"
+)
+
+func main() {
+    d, _ := ioutil.ReadFile("input")
+    strings := strings.Split(string(d),"\n")
+    var ints []int
+    for _, s := range strings {
+        i, err := strconv.Atoi(s)
+        if err == nil {
+            ints = append(ints, i)
+        }
+    }
+    sort.Ints(ints)
+    counts := make(map[int]int)
+    ints = append(ints, ints[len(ints)-1]+3) // add the phone
+    prev := 0
+    for _, c := range ints {
+        d := c - prev
+        prev = c
+        counts[d] += 1
+    }
+    fmt.Println("Part 1:", counts[1] * counts[3]) // add the final one
+}