20201105: find target

20201105_find_target/main.go

@@ -0,0 +1,56 @@
+package main
+
+import "fmt"
+
+var nums = []int{1, 2, 7, 9, 13, 57, 36, 26, 55, 11, 6, 3, 89, 36, 75, 36, 76, 95, 98, 101, 320, 520, 85, 36, 62, 49, 96, 1}
+
+func main() {
+	fmt.Println("num=", findTargetInNums(35, nums))
+	fmt.Println(findTargetInNums2(35, nums))
+}
+
+func findTargetInNums(target int, nums []int) []int {
+	for x, i := range nums {
+		if i >= target {
+			continue
+		}
+		for y, j := range nums {
+			if i == j {
+				continue
+			}
+			if i+j == target {
+				return []int{x, y}
+			}
+		}
+	}
+	return nil
+}
+
+func findTargetInNums2(target int, nums []int) []ret {
+	var r []ret
+	for x, i := range nums {
+		if i >= target {
+			continue
+		}
+		for y, j := range nums {
+			if i == j {
+				continue
+			}
+			if i+j == target {
+				r = append(r, ret{i, x})
+				r = append(r, ret{j, y})
+				return r
+			}
+		}
+	}
+	return r
+}
+
+type ret struct {
+	num       int
+	subscript int
+}
+
+func (r ret) String() string {
+	return fmt.Sprintf("num=%d-sub=%d", r.num, r.subscript)
+}

20201105_find_target/main_test.go

@@ -0,0 +1,56 @@
+package main
+
+import (
+	"reflect"
+	"testing"
+)
+
+func Test_findTargetInNums(t *testing.T) {
+	type args struct {
+		target int
+		nums   []int
+	}
+	tests := []struct {
+		name string
+		args args
+		want []int
+	}{
+		{
+			"3_in_1_2",
+			args{3, []int{1, 2}},
+			[]int{0, 1},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := findTargetInNums(tt.args.target, tt.args.nums); !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("findTargetInNums() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func Test_findTargetInNums2(t *testing.T) {
+	type args struct {
+		target int
+		nums   []int
+	}
+	tests := []struct {
+		name string
+		args args
+		want []ret
+	}{
+		{
+			"3_in_1_2",
+			args{3, []int{1, 2}},
+			[]ret{{1, 0}, {2, 1}},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := findTargetInNums2(tt.args.target, tt.args.nums); !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("findTargetInNums2() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}