CODEWITHSUNDEEP
javajava.util.scannertime-limiting
FullAdder
FullAdder

Reputation: 21

Time limit exceeded using Scanner - Java

I'm testing this code in Java with a problem from a programming Judge and I get a "time limit" error. I guess the scanner.hasNextDouble() thingy is not working somehow.

It works with the public inputs shown in the link but it throws this time limit error with the privates.

Any idea to solve this issue?

import java.util.Scanner;
import java.text.NumberFormat;
import java.util.Locale;

class Main /*AvalPoli2*/ {
    public static void main(String[] args) {
        NumberFormat nf = NumberFormat.getNumberInstance(Locale.US); // dot sep.
        nf.setGroupingUsed(false); // don't group in groups of 3 
        nf.setMaximumFractionDigits(4); 
        nf.setMinimumFractionDigits(4);
        Scanner scanner = new Scanner(System.in);
        scanner.useLocale(Locale.US); // read doubles with dot separator
        double sum = 0.0000;
        double x = 0;
        if (scanner.hasNextDouble()) x = scanner.nextDouble();
        while (scanner.hasNextDouble()) {
            sum *= x;
            sum += scanner.nextDouble();
        }
        System.out.println(nf.format(sum));
    }
}

Thank you very much! ^_^

Upvotes: 2

Views: 1039

Answers (2)

Tom Ming
Tom Ming

Reputation: 1

You can create a Reader class by yourself, here is my Reader class code.

/** Reader Class */
static class Reader {
    BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer tokenizer = new StringTokenizer("");

    /** Get next line text */
    String next() throws IOException {
        while (!tokenizer.hasMoreTokens()) {
            tokenizer = new StringTokenizer(reader.readLine());
        }
        return tokenizer.nextToken();
    }

    int nextInt() throws IOException {
        return Integer.parseInt(next());
    }

    double nextDouble() throws IOException {
        return Double.parseDouble(next());
    }
}

To use this class, you need to create an object(assume it named reader). To get a int number, you should reader.nextInt(). To get a Double number, you should reader.nextDouble.

Upvotes: 0

Sazzad Hissain Khan
Sazzad Hissain Khan

Reputation: 40206

You have to Wrap your System.in, like

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
in = new Scanner(br);

instead,

in = new Scanner(System.in);

Upvotes: 1

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