20201215

20201215/main.go

@@ -0,0 +1,35 @@
+package main
+
+func main() {
+
+}
+
+func isValid(s string) bool {
+	if len(s)%2 == 1 {
+		return false
+	}
+	var stack []uint8
+	for i := 0; i < len(s); i++ {
+		c := s[i]
+		switch c {
+		case '(':
+			fallthrough
+		case '{':
+			fallthrough
+		case '[':
+			stack = append(stack, c)
+		default:
+			if len(stack) == 0 {
+				return false
+			}
+			last := stack[len(stack)-1]
+			if (last == '(' && c == ')') || last == '[' && c == ']' || last == '{' && c == '}' {
+				stack = stack[:len(stack)-1]
+			}
+		}
+	}
+	if len(stack) == 0 {
+		return true
+	}
+	return false
+}

20201215/main_test.go

@@ -0,0 +1,57 @@
+package main
+
+import "testing"
+
+func Test_isValid(t *testing.T) {
+	type args struct {
+		s string
+	}
+	tests := []struct {
+		name string
+		args args
+		want bool
+	}{
+		{
+			"test1",
+			args{
+				"()",
+			},
+			true,
+		},
+		{
+			"test2",
+			args{
+				"()[]{}",
+			},
+			true,
+		},
+		{
+			"test3",
+			args{
+				"(]",
+			},
+			false,
+		},
+		{
+			"test4",
+			args{
+				"([)]",
+			},
+			false,
+		},
+		{
+			"test5",
+			args{
+				"{[]}",
+			},
+			true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := isValid(tt.args.s); got != tt.want {
+				t.Errorf("isValid() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}