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C++ replace HackerRank Solution
/* Enter your code here. Read input from STDIN. Print output to STDOUT */
#include <cstdio>
#include <cstring>
#include <cmath>
#include <algorithm>
#include <string>
#include <vector>
#include <map>
#include <set>
#include <cctype>
#include <numeric>
#include <queue>
#include <iostream>
#include <iomanip>
#include <sstream>
#define FOR(i,s,e) for(int i=(s);i<(int)(e);i++)
#define FOE(i,s,e) for(int i=(s);i<=(int)(e);i++)
#define ALL(x) (x).begin(), (x).end()
#define CLR(s) memset(s,0,sizeof(s))
#define PB push_back
using namespace std;
typedef long long LL;
typedef pair<int,int> pii;
typedef map<int,int> mii;
typedef vector<int> vi;
#define x first
#define y second
const int N = 60;
int sum = 0;
int sg[N+5];
int a[1000];
int kk = 0;
void F(int n, int f, int xr, vi &v) {
// create a pile of size "f"
n -= f;
xr ^= sg[f];
if (n<0) return;
if (n==0) {
// FOR(i,0,kk) printf("%d ", a[i]); puts("");
// FOR(i,0,kk) printf("%s%d ", (i==0?"(":""), sg[a[i]]); puts(")");
v.PB(xr);
return;
}
for(int k=f+1;k<=n;k++) {
a[kk++] = k;
F(n, k, xr, v);
kk--;
}
}
void init() {
CLR(sg);
FOE(i,1,N) {
vi v;
F(i, 0, 0, v);
sort(v.begin(), v.end());
v.erase(v.begin()); // single..
// FOR(r,0,v.size()) printf("->%d",v[r]);puts("");
v.erase(unique(v.begin(), v.end()), v.end());
// mex
int lt = -1;
FOR(j,0,v.size()) {
if(v[j] != lt+1) break;
lt = v[j];
}
sg[i] = lt+1;
// printf("[%d] %d\n\n", i, sg[i]);
}
}
int main() {
init();
int n, t;
cin >> t;
while (t--) {
cin >> n;
int xr = 0, x;
while (n--) {
cin >> x;
xr ^= sg[x];
}
cout << (xr ? "ALICE" : "BOB") << endl;
}
return 0;
}
Java rep HackerRank Solution
import java.io.*;
import java.math.BigInteger;
import java.util.*;
public class Solution implements Runnable {
// leave empty to read from stdin/stdout
private static final String TASK_NAME_FOR_IO = "";
// file names
private static final String FILE_IN = TASK_NAME_FOR_IO + ".in";
private static final String FILE_OUT = TASK_NAME_FOR_IO + ".out";
BufferedReader in;
PrintWriter out;
StringTokenizer tokenizer = new StringTokenizer("");
public static void main(String[] args) {
new Solution().run();
}
class State {
int[] d;
public State(int num) {
this(Arrays.asList(num));
}
public State(int num1, int num2) {
this(Arrays.asList(num1, num2));
}
public State(int num1, int num2, int num3) {
this(Arrays.asList(num1, num2, num3));
}
State(Collection<Integer> current) {
d = new int[current.size()];
int idx = 0;
for (int v : current) {
d[idx++] = v;
}
Arrays.sort(d);
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
State state = (State) o;
if (!Arrays.equals(d, state.d)) return false;
return true;
}
@Override
public int hashCode() {
return d != null ? Arrays.hashCode(d) : 0;
}
public State replaceAndTrim(int idxReplace, State replaceWith) {
List<Integer> all = new ArrayList<Integer>();
for (int i = 0; i < d.length; i++)
if (i != idxReplace && d[i] >= 3) {
all.add(d[i]);
}
for (int i = 0; i < replaceWith.d.length; i++)
if (replaceWith.d[i] >= 3) {
all.add(replaceWith.d[i]);
}
return new State(all);
}
public boolean isEmpty() {
return d.length <= 0;
}
}
class Split {
List<State> list = new ArrayList<State>();
public void add(LinkedList<Integer> current) {
list.add(new State(current));
}
}
class GameState {
State state;
int who;
GameState(State state, int who) {
this.state = state;
this.who = who;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
GameState gameState = (GameState) o;
if (who != gameState.who) return false;
if (state != null ? !state.equals(gameState.state) : gameState.state != null) return false;
return true;
}
@Override
public int hashCode() {
int result = state != null ? state.hashCode() : 0;
result = 31 * result + who;
return result;
}
}
int MAX_STONES = 50;
Split[] splits = new Split[MAX_STONES + 1];
Map<GameState, Boolean> answer = new HashMap<GameState, Boolean>();
Map<GameState, Long> answerGrandi = new HashMap<GameState, Long>();
int[] GRANDI = new int[] {
0,
0,
0,
1,
0,
2,
3,
4,
0,
5,
6,
7,
8,
9,
10,
11,
12,
13,
14,
15,
16,
17,
18,
19,
20,
21,
22,
23,
24,
25,
26,
27,
28,
29,
30,
31,
32,
33,
34,
35,
36,
37,
38,
39,
40,
41,
42,
43,
44,
45,
46
};
private void solve() throws IOException {
for (int i = 0; i <= MAX_STONES; i++) {
splits[i] = new Split();
genSplits(i, 0, splits[i], new LinkedList<Integer>());
}
/*
for (int i = 0; i <= 50; i++) {
System.out.println(grandi(new State(i), 0) + ", ");
}
*/
int tc = nextInt();
for (int t = 0; t < tc; t++) {
int n = nextInt();
int xor = 0;
for (int i = 0; i < n; i++) {
// xor ^= grandi(new State(nextInt()), 0);
xor ^= GRANDI[nextInt()];
}
if (xor != 0) {
out.println("ALICE");
} else {
out.println("BOB");
}
}
}
private void compareWithNaive() {
for (int i = 1; i <= 20; i++) {
State state = new State(i);
boolean a1 = play(state, 0);
boolean a2 = grandi(new State(i), 0) != 0;
if (a1 != a2) {
throw new IllegalStateException("Error: " + i);
}
}
for (int i = 1; i <= 20; i++)
for (int j = 1; j <= 20; j++) {
State state = new State(i, j);
boolean a1 = play(state, 0);
boolean a2 = (grandi(new State(i), 0) ^ grandi(new State(j), 0)) != 0;
if (a1 != a2) {
throw new IllegalStateException();
}
}
for (int i = 1; i <= 20; i++)
for (int j = 1; j <= 20; j++)
for (int k = 1; k <= 20; k++) {
State state = new State(i, j, k);
boolean a1 = play(state, 0);
boolean a2 = (grandi(new State(i), 0) ^ grandi(new State(j), 0) ^ grandi(new State(k), 0)) != 0;
if (a1 != a2) {
throw new IllegalStateException();
}
}
}
private boolean play(State state, int who) {
if (state.isEmpty()) {
return false;
}
GameState gameState = new GameState(state, who);
if (answer.containsKey(gameState)) {
return answer.get(gameState);
}
boolean win = false;
Set<Integer> tried = new HashSet<Integer>();
for (int idxReplace = 0; idxReplace < state.d.length; idxReplace++) {
int num = state.d[idxReplace];
if (tried.contains(num)) {
continue;
}
tried.add(num);
for (State replaceWith : splits[num].list) {
State nState = state.replaceAndTrim(idxReplace, replaceWith);
boolean otherWins = play(nState, 1 - who);
if (!otherWins) {
win = true;
break;
}
}
if (win) {
break;
}
}
answer.put(gameState, win);
return win;
}
private long grandi(State state, int who) {
if (state.isEmpty()) {
return 0;
}
GameState gameState = new GameState(state, who);
if (answerGrandi.containsKey(gameState)) {
return answerGrandi.get(gameState);
}
Set<Long> grandiAll = new HashSet<Long>();
for (int idxReplace = 0; idxReplace < state.d.length; idxReplace++) {
int num = state.d[idxReplace];
for (State replaceWith : splits[num].list) {
State nState = state.replaceAndTrim(idxReplace, replaceWith);
grandiAll.add(grandi(nState, 1 - who));
}
}
long result = 0;
while (grandiAll.contains(result)) {
result++;
}
answerGrandi.put(gameState, result);
return result;
}
private void genSplits(int remaining, int lastUsed, Split split, LinkedList<Integer> current) {
if (remaining < 0) {
throw new IllegalStateException();
}
if (remaining == 0) {
if (current.size() > 1) {
split.add(current);
}
return;
}
int i = lastUsed + 1;
while (remaining - i >= 0) {
current.addLast(i);
genSplits(remaining - i, i, split, current);
current.removeLast();
i++;
}
}
public void run() {
long timeStart = System.currentTimeMillis();
boolean fileIO = TASK_NAME_FOR_IO.length() > 0;
try {
if (fileIO) {
in = new BufferedReader(new FileReader(FILE_IN));
out = new PrintWriter(new FileWriter(FILE_OUT));
} else {
in = new BufferedReader(new InputStreamReader(System.in));
out = new PrintWriter(new OutputStreamWriter(System.out));
}
solve();
in.close();
out.close();
} catch (IOException e) {
throw new IllegalStateException(e);
}
long timeEnd = System.currentTimeMillis();
if (fileIO) {
System.out.println("Time spent: " + (timeEnd - timeStart) + " ms");
}
}
private String nextToken() throws IOException {
while (!tokenizer.hasMoreTokens()) {
String line = in.readLine();
if (line == null) {
return null;
}
tokenizer = new StringTokenizer(line);
}
return tokenizer.nextToken();
}
private int nextInt() throws IOException {
return Integer.parseInt(nextToken());
}
private BigInteger nextBigInt() throws IOException {
return new BigInteger(nextToken());
}
private long nextLong() throws IOException {
return Long.parseLong(nextToken());
}
private double nextDouble() throws IOException {
return Double.parseDouble(nextToken());
}
}
Python 3 rep HackerRank Solution
Python 2 rep HackerRank Solution
from bisect import bisect
L = [1, 2, 4, 8]
def win(piles):
w = 0
for x in piles:
w ^= 0 if x in L else x - bisect(L, x)
return w
for test_i in xrange(int(raw_input())):
raw_input()
print "ALICE" if win(map(int, raw_input().split())) else "BOB"
C rep HackerRank Solution
Warmup
Implementation
Strings
Sorting
Search
Graph Theory
Greedy
Dynamic Programming
Constructive Algorithms
Bit Manipulation
Recursion
Game Theory
NP Complete
Debugging
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