diff --git a/26/03/1980.go b/26/03/1980.go
new file mode 100644
index 0000000..6f25006
--- /dev/null
+++ b/26/03/1980.go
@@ -0,0 +1,29 @@
+package main
+
+import (
+	"fmt"
+	"strconv"
+)
+
+func findDifferentBinaryString(nums []string) string {
+	n := len(nums)
+	m := make(map[int]int)
+	mx := 1 << n
+	for _, v := range nums {
+		temp := 0
+		for i, b := range v {
+			if b == '1' {
+				temp += 1 << (n - 1 - i)
+			}
+		}
+		m[temp] = 1
+	}
+	for i := range mx {
+
+		if _, ok := m[i]; !ok {
+			s := strconv.FormatInt(int64(i), 2)
+			return fmt.Sprintf("%0*s", n, s)
+		}
+	}
+	return ""
+}