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  3. Algebra
  4. Manasa and Sub-sequences
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Manasa and Sub-sequences

  • trung91nk
     + 0 comments

    Anyone has any ideas for optimizing my code in Java ? I have failed for the 2 last tests..

    static long solve(String s) {
        BigInteger sum = BigInteger.valueOf(Character.getNumericValue(s.charAt(0)));
        for(int i=1;i<s.length();i++){
            sum = sum.multiply(BigInteger.valueOf(11)).add(BigInteger.valueOf(2).pow(i).multiply(BigInteger.valueOf(Character.getNumericValue(s.charAt(i)))));
        }
        return sum.mod(BigInteger.valueOf(1000000007)).longValue();
    }