chore: add hackerrank solutions

hacker-rank/flipping-bits/main.go

@@ -0,0 +1,64 @@
+package main
+
+import (
+    "bufio"
+    "fmt"
+    "io"
+    "os"
+    "strconv"
+    "strings"
+)
+
+/*
+ * Complete the 'flippingBits' function below.
+ *
+ * The function is expected to return a LONG_INTEGER.
+ * The function accepts LONG_INTEGER n as parameter.
+ */
+
+func flippingBits(n int64) int64 {
+    // Write your code here
+    max := int64(^uint32(0))
+    return n ^ max
+}
+
+func main() {
+    reader := bufio.NewReaderSize(os.Stdin, 16 * 1024 * 1024)
+
+    stdout, err := os.Create(os.Getenv("OUTPUT_PATH"))
+    checkError(err)
+
+    defer stdout.Close()
+
+    writer := bufio.NewWriterSize(stdout, 16 * 1024 * 1024)
+
+    qTemp, err := strconv.ParseInt(strings.TrimSpace(readLine(reader)), 10, 64)
+    checkError(err)
+    q := int32(qTemp)
+
+    for qItr := 0; qItr < int(q); qItr++ {
+        n, err := strconv.ParseInt(strings.TrimSpace(readLine(reader)), 10, 64)
+        checkError(err)
+
+        result := flippingBits(n)
+
+        fmt.Fprintf(writer, "%d\n", result)
+    }
+
+    writer.Flush()
+}
+
+func readLine(reader *bufio.Reader) string {
+    str, _, err := reader.ReadLine()
+    if err == io.EOF {
+        return ""
+    }
+
+    return strings.TrimRight(string(str), "\r\n")
+}
+
+func checkError(err error) {
+    if err != nil {
+        panic(err)
+    }
+}