Update problem 476

Author: avhn

algorithms/476/solution.go

@@ -3,7 +3,7 @@ package main
 // Time and space complexity, O(1)
 func findComplement(num int) int {
 var c int
-for m := 1; num != 0; m, num = m*2, num>>1 {
+for m := 1; num != 0; m, num = m<<1, num>>1 {
 if num&1 != 1 {
 c += m
 }