omg. for JAVA you need to go to java 7 and dont touch anything else, but the 3 places that need to be fixed!

we need to report somehow such awful exercises

for i in range(len(s)): if s[i] == t[i]: res += "0" else: res +="1"

return res

I tried to submit the following method: public static void main(String args[] ) throws Exception { /* Enter your code here. Read input from STDIN. Print output to STDOUT */ BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in)); String s = bufferedReader.readLine(), t = bufferedReader.readLine(); System.out.println(IntStream.range(0, s.length()).mapToObj(i -> String.valueOf(s.charAt(i) ^ t.charAt(i))).collect(Collectors.joining()));

} although it visually presents the same result. It is difficult to understand what the real problem is.

I have checked multiple times, my logic is correct, the output I am printing is also correct but compiler says wrong answer. Any idea? Compiler Message: Wrong Answer Input (stdin) 10101 00101 Your Output (stdout) 10000 Expected Output 10000

C++ test:

do not refactor, just fix three errors. There is a bug somewhere on test backend, it fails tests if submitted under C++20/C++23. If submitted under C++14, it passes all tests. It is a bug on the HR backend, the same code compiled under gcc with C++20 compliance works just fine.