31: coin sums

31_coin_sums/main.go

@@ -0,0 +1,20 @@
+package main
+
+import "fmt"
+
+var coins = []int{1, 2, 5, 10, 20, 50, 100, 200}
+
+func main() {
+	fmt.Println(sumCoins(200))
+}
+
+func sumCoins(target int) int {
+	t := make([]int, target+1)
+	t[0] = 1
+	for _, c := range coins {
+		for j := c; j <= target; j++ {
+			t[j] += t[j-c]
+		}
+	}
+	return t[target]
+}