code/FoxAndMp3.java at master · kishorepatel/code

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import java.util.*;

public class FoxAndMp3 {

public String[] playList(int n) {

Set<String> set = new HashSet<>();

for(int i = 0, m = 1; i < 10; i++, m *= 10){

for(int j = 0; j <= 50; j++){

if(m+j <= n){

set.add((m+j)+ ".mp3");

}

List<String> al = new ArrayList<>();

for(String s : set)al.add(s);

Collections.sort(al);

if(n > 50) n = 50;

String[] ans = new String[n];

for(int i = 0; i < ans.length; i++) ans[i] = al.get(i);

return ans;

}

// BEGIN CUT HERE

public static void main(String[] args) {

if (args.length == 0) {

FoxAndMp3Harness.run_test(-1);

} else {

for (int i=0; i<args.length; ++i)

FoxAndMp3Harness.run_test(Integer.valueOf(args[i]));

}

// END CUT HERE

}

// BEGIN CUT HERE

class FoxAndMp3Harness {

public static void run_test(int casenum) {

if (casenum != -1) {

if (runTestCase(casenum) == -1)

System.err.println("Illegal input! Test case " + casenum + " does not exist.");

return;

}

int correct = 0, total = 0;

for (int i=0;; ++i) {

int x = runTestCase(i);

if (x == -1) {

if (i >= 100) break;

continue;

}

correct += x;

++total;

}

if (total == 0) {

System.err.println("No test cases run.");

} else if (correct < total) {

System.err.println("Some cases FAILED (passed " + correct + " of " + total + ").");

} else {

System.err.println("All " + total + " tests passed!");

}

static boolean compareOutput(String[] expected, String[] result) { if (expected.length != result.length) return false; for (int i=0; i<expected.length; ++i) if (!expected[i].equals(result[i])) return false; return true; }

static String formatResult(String[] res) {

String ret = "";

ret += "{";

for (int i=0; i<res.length; ++i) {

if (i > 0) ret += ",";

ret += String.format(" \"%s\"", res[i]);

}

ret += " }";

return ret;

}

static int verifyCase(int casenum, String[] expected, String[] received) {

System.err.print("Example " + casenum + "... ");

if (compareOutput(expected, received)) {

System.err.println("PASSED");

return 1;

} else {

System.err.println("FAILED");

System.err.println(" Expected: " + formatResult(expected));

System.err.println(" Received: " + formatResult(received));

return 0;

}

static int runTestCase(int casenum__) {

switch(casenum__) {

case 0: {

int n = 3;

String[] expected__ = {"1.mp3", "2.mp3", "3.mp3" };