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Unique Divide And Conquer – HackerRank Solution Java , Python 3, Python 2 , C , C++, Best and Optimal Solutions , All you need.
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C++ replace HackerRank Solution
#include <bits/stdc++.h>
using namespace std;
#define rep(i, from, to) for (int i = from; i < (to); ++i)
#define trav(a, x) for (auto& a : x)
#define all(x) x.begin(), x.end()
#define sz(x) (int)(x).size()
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
ll mod;
vector<ll> fact, ifact;
vector<int> mem;
vector<vector<int>> mem2;
ll solve2(int left, int max);
ll rsolve(int n) {
if (n <= 5) return n != 2;
return solve2(n-1, (n-1)/2);
}
ll solve(int n) {
assert(n > 0);
int& out = mem[n];
if (out != -1) return out;
return out = (int)(rsolve(n) * n % mod);
}
ll solve2(int left, int max) {
if (left == 0) return 1;
if (!max) return 0;
int& out = mem2[left][max];
if (out != -1) return out;
ll res = solve2(left, max-1);
if (max > left) return out = (int)res;
int lim = left / max;
ll one = solve(max) * max % mod * ifact[max] % mod;
ll mult = one * fact[left] % mod;
for (int i = 1;; i++) {
ll bin = ifact[i] * ifact[left - i * max] % mod;
res += solve2(left - i * max, max-1) * mult % mod * bin;
if (i == lim) break;
if (i % 4 == 0) res %= mod;
mult = mult * one % mod;
}
res %= mod;
return out = (int)res;
}
int main() {
cin.sync_with_stdio(false);
cin.exceptions(cin.failbit);
int N;
cin >> N >> mod;
mem.assign(N+1, -1);
mem2.assign(N+1, vector<int>(N+1, -1));
int LIM = N+1;
ll* inv = new ll[LIM] - 1; inv[1] = 1;
rep(i,2,LIM) inv[i] = mod - (mod / i) * inv[mod % i] % mod;
fact.resize(N+1);
ifact.resize(N+1);
fact[0] = ifact[0] = 1;
rep(i,1,N+1) {
fact[i] = fact[i-1] * i % mod;
ifact[i] = ifact[i-1] * inv[i] % mod;
}
cout << solve(N) << endl;
exit(0);
}
Java rep HackerRank Solution
import java.awt.Point;
import java.awt.geom.Line2D;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.security.GuardedObject;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Hashtable;
import java.util.InputMismatchException;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.PriorityQueue;
import java.util.Queue;
import java.util.Random;
import java.util.Scanner;
import java.util.Stack;
import java.util.StringTokenizer;
import java.util.TreeMap;
import java.util.TreeSet;
import java.io.InputStream;
import java.math.BigInteger;
/**
* Built using CHelper plug-in
* Actual solution is at the top
*/
public class Main {
public static void main(String[] args) throws IOException {
InputStream inputStream = System.in;
OutputStream outputStream = System.out;
FastScanner in;
PrintWriter out;
in=new FastScanner(System.in);
out=new PrintWriter(System.out);
//in=new FastScanner(new FileInputStream(new File("C://Users//KANDARP//Desktop//coding_contest_creation (1).txt")));
TaskC solver = new TaskC();
long var=System.currentTimeMillis();
solver.solve(1, in, out);
/*if(System.getProperty("ONLINE_JUDGE")==null){
out.println("["+(double)(System.currentTimeMillis()-var)/1000+"]");
}*/
out.close();
}
}
class Pair {
long x,y,index;
long r1,r2;
Pair(long x,long y,int index){
this.x=x;
this.y=y;
this.index=index;
}
public String toString(){
return this.x+" "+this.y+" ";
}
}
class Edge implements Comparable<Edge>{
int u;
int v;
int time;
long cost;
long wcost;
public Edge(int u,int v,long cost,long wcost){
this.u=u;
this.v=v;
this.cost=cost;
this.wcost=wcost;
time=Integer.MAX_VALUE;
}
public int other(int x){
if(u==x)return v;
return u;
}
@Override
public int compareTo(Edge o) {
// TODO Auto-generated method stub
return Long.compare(cost, o.cost);
}
}
class queary{
int type;
int l;
int r;
int index;
queary(int type,int l,int r,int index){
this.type=type;
this.l=l;
this.r=r;
this.index=index;
}
}
class TaskC {
static long mod=1000000007;
static int prime_len=1000010;
static int prime[]=new int[prime_len];
static long n_prime[]=new long[prime_len];
static ArrayList<Integer> primes=new ArrayList<>();
static{
for(int i=2;i<=Math.sqrt(prime.length);i++){
for(int j=i*i;j<prime.length;j+=i){
prime[j]=i;
}
}
for(int i=2;i<prime.length;i++){
n_prime[i]=n_prime[i-1];
if(prime[i]==0){
n_prime[i]++;
}
}
// System.out.println("end");
// prime[0]=true;
// prime[1]=1;
}
/*
* long pp[]=new long[10000001];
pp[0]=0;
pp[1]=1;
for(int i=2;i<pp.length;i++){
if(prime[i]!=0){
int gcd=(int)greatestCommonDivisor(i/prime[i], prime[i]);
pp[i]=(pp[i/prime[i]]*pp[prime[i]]*gcd)/pp[(int)gcd];
}
else
pp[i]=i-1;
}
}
* */
class TrieNode{
int value;
TrieNode children[];
public TrieNode(int value,TrieNode children[] ){
this.value=value;
this.children=children;
}
}
class Trie{
TrieNode root;
int count;
public Trie(TrieNode root,int count){
this.root=root;
this.count=count;
}
}
public void insert(Trie t,char key[]){
t.count++;
int length=key.length;
int level=0;
TrieNode current=t.root;
if(current==null){
t.root=new TrieNode(0, new TrieNode[26]);
current=t.root;
}
for(level=0;level<length;level++){
int index=key[level]-'a';
if(current.children[index]==null){
current.children[index]=new TrieNode(0,new TrieNode[26]);
}
current=current.children[index];
}
current.value=t.count;
}
public int search(Trie t,char key[]){
TrieNode current=t.root;
if(current==null){
return 0;
}
int length=key.length;
int level=0;
for(level=0;level<length;level++){
int index=key[level]-'a';
if(current.children[index]==null){
return 0;
}
current=current.children[index];
}
return current.value;
}
class point implements Comparable<point>{
long x;
long y;
public point(long x,long y){
this.x=x;
this.y=y;
}
@Override
public int compareTo(point o) {
// TODO Auto-generated method stub
if(o.x==x && o.y==y)
return 0;
else return (int)Math.max(x-o.x, y-o.y);
}
public int hashCode(){
return (int)(x+y);
}
public boolean equals(Object z){
if(z!=null){
point o=(point)z;
if(o.x==x && o.y==y)
return true;
}
return false;
}
}
class Edge {
int t, rev, cap, f;
public Edge(int t, int rev, int cap) {
this.t = t;
this.rev = rev;
this.cap = cap;
}
}
class MaxFlowDinic {
public List<Edge>[] createGraph(int nodes) {
List<Edge>[] graph = new List[nodes];
for (int i = 0; i < nodes; i++)
graph[i] = new ArrayList<>();
return graph;
}
public void addEdge(List<Edge>[] graph, int s, int t, int cap) {
graph[s].add(new Edge(t, graph[t].size(), cap));
graph[t].add(new Edge(s, graph[s].size() - 1, 0));
}
boolean dinicBfs(List<Edge>[] graph, int src, int dest, int[] dist) {
Arrays.fill(dist, -1);
dist[src] = 0;
int[] Q = new int[graph.length];
int sizeQ = 0;
Q[sizeQ++] = src;
for (int i = 0; i < sizeQ; i++) {
int u = Q[i];
for (Edge e : graph[u]) {
if (dist[e.t] < 0 && e.f < e.cap) {
dist[e.t] = dist[u] + 1;
Q[sizeQ++] = e.t;
}
}
}
return dist[dest] >= 0;
}
int dinicDfs(List<Edge>[] graph, int[] ptr, int[] dist, int dest, int u, int f) {
if (u == dest)
return f;
for (; ptr[u] < graph[u].size(); ++ptr[u]) {
Edge e = graph[u].get(ptr[u]);
if (dist[e.t] == dist[u] + 1 && e.f < e.cap) {
int df = dinicDfs(graph, ptr, dist, dest, e.t, Math.min(f, e.cap - e.f));
if (df > 0) {
e.f += df;
graph[e.t].get(e.rev).f -= df;
return df;
}
}
}
return 0;
}
public int maxFlow(List<Edge>[] graph, int src, int dest) {
int flow = 0;
int[] dist = new int[graph.length];
while (dinicBfs(graph, src, dest, dist)) {
int[] ptr = new int[graph.length];
while (true) {
int df = dinicDfs(graph, ptr, dist, dest, src, Integer.MAX_VALUE);
if (df == 0)
break;
flow += df;
}
}
return flow;
}
}
//int arr[]=new int[1000000000];
int nodes, c[][], inv[], dp[],dp2[][];
public void solve(int testNumber, FastScanner in, PrintWriter out) throws IOException {
nodes = in.nextInt();
mod = in.nextInt();
c = new int[nodes + 5][];
c[0] = new int[] { 1 };
for (int i = 1; i < c.length; i++) {
c[i] = new int[i + 1];
c[i][0] = c[i][i] = 1;
for (int j = 1; j < i; j++) {
c[i][j] = c[i - 1][j - 1] + c[i - 1][j];
if (c[i][j] >= mod)
c[i][j] -= mod;
}
}
inv = new int[nodes+6];
for (int i = 0; i < inv.length; i++)
inv[i] = (int) pow(i, mod - 2,mod);
dp = new int[nodes + 1];
Arrays.fill(dp, -1);
dp2 = new int[nodes + 1][];
for (int i = 0; i <= nodes; i++) {
dp2[i] = new int[i + 1];
Arrays.fill(dp2[i], -1);
}
out.println(CalculateAns(nodes));
}
public long[] fun(long n,int k,int a){
long arr[]=new long[k];
for(int i=0;i<k;i++){
arr[(int)(pow(i, a, k)%k)]+=((n/k)%mod+ ((i!=0 && i<=n%k)? 1: 0))%mod;
}
return arr;
}
int CalculateAns(int n) {
if (dp[n] != -1)
return dp[n];
int ans = 0;
if (n <= 1)
ans = 1;
else
ans = (int) ((n * 1L * calculateHelperDp(n - 1, (n + 1) / 2 - 1)) % mod);
dp[n] = ans;
return ans;
}
int calculateHelperDp(int n, int k) {
if (n == 0)
return 1;
if (k == 0)
return 0;
k = Math.min(k, n);
if (dp2[n][k] != -1)
return dp2[n][k];
long ans = 0, coffecient = 1;
for (int i = 0; i * k <= n; i++) {
ans += coffecient * calculateHelperDp(n - i * k, k - 1);
ans %= mod;
if(k<=n-i*k){
coffecient *= c[n - i * k][k];coffecient %= mod;
coffecient *= inv[i + 1];coffecient %= mod;
coffecient *= CalculateAns(k);coffecient %= mod;
coffecient *= k;coffecient %= mod;
}
}
dp2[n][k] = (int) ans;
return (int) ans;
}
public long getAns(int d[],int n){
if(d[0]<0 && d[n-1]>0){
return Math.min(-2*d[0]+d[n-1], 2*d[n-1]-d[0]);
}
else{
if(d[0]<0){
return d[0]*-1;
}
else{
return(d[n-1]*1);
}
}
// return 0;
}
public boolean isTriangle(int x,int y,int z){
if(x+y>z && x+z>y && y+z>x){
return true;
}
return false;
}
public long optimize(long x){
long y=x;
if(x%10<5){
x=x-x%10;
}
else{
x=x+(10-x%10);
}
return y-x;
}
public static long[][] matrixexpo(long m[][],String n,long mod){
if(n.equals("1")){
return m.clone();
}
if(n.equals("10")){
return mulmatrix(m, m , mod);
}
else{
long temp [][]=matrixexpo(m,n.substring(0,n.length()-1),mod);
temp=mulmatrix(temp, temp, mod);
if(n.charAt(n.length()-1)=='0')return temp;
else return mulmatrix(temp, m,mod);
}
}
public static long[] mul(long[] a, long[] b)
{
int n = Math.max(a.length, b.length);
int h = Integer.highestOneBit(n);
if(n > h)h *= 2;
if(a.length < h)a = Arrays.copyOf(a, h);
if(b.length < h)b = Arrays.copyOf(b, h);
return mul2(a, b, 0, h, 0, h);
}
public static long[] mul2(long[] a, long[] b, int al, int ar, int bl, int br)
{
int n = ar-al;
if((n&n-1) != 0)throw new RuntimeException();
if(n <= 1<<6){
long[] res = muln(a, b, al, ar, bl, br);
return res;
}
long[] c0 = mul2(a, b, al+0, al+n/2, bl+0, bl+n/2);
long[] c2 = mul2(a, b, al+n/2, al+n, bl+n/2, bl+n);
long[] ab0 = new long[n/2];
long[] ab1 = new long[n/2];
for(int i = 0;i < n/2;i++){
ab0[i] = a[al+i] + a[al+i+n/2];
ab1[i] = b[bl+i] + b[bl+i+n/2];
if(ab0[i] >= mod)ab0[i] -= mod;
if(ab1[i] >= mod)ab1[i] -= mod;
}
int e = n+c2.length;
long[] ret = new long[e];
for(int i = 0;i < c0.length;i++){
ret[i] += c0[i];
if(ret[i] >= mod)ret[i] -= mod;
}
for(int i = 0;i < c2.length;i++){
ret[i+n] += c2[i];
if(ret[i+n] >= mod)ret[i+n] -= mod;
}
long[] c1 = mul2(ab0, ab1, 0, n/2, 0, n/2);
for(int i = 0;i < c1.length;i++){
c1[i] -= c0[i] + c2[i];
if(c1[i] < 0)c1[i] += mod;
if(c1[i] < 0)c1[i] += mod;
}
for(int i = 0;i < c1.length;i++){
ret[i+n/2] += c1[i];
if(ret[i+n/2] >= mod)ret[i+n/2] -= mod;
}
return ret;
}
public static long[] muln(long[] a, long[] b, int al, int ar, int bl, int br)
{
int n = ar - al;
long[] ret = new long[2*n];
for(int i = 0;i < 2*n;i++){
long tot = 0;
for(int j = Math.max(i-n+1, 0);j <= i && j < n;j++){
tot += a[al+j] * b[bl+i-j];
}
ret[i] = tot % mod;
}
return ret;
}
public static long[][] mulmatrix(long m1[][],long m2[][],long mod){
long ans[][]=new long[m1.length][m2[0].length];
for(int i=0;i<m1.length;i++){
for(int j=0;j<m2[0].length;j++){
for(int k=0;k<m1.length;k++){
ans[i][j]+=(m1[i][k]*m2[k][j]);
ans[i][j]%=mod;
}
}
}
return ans;
}
long pow(long x,long y,long mod){
if(y<=0){
return 1;
}
if(y==1){
return x%mod;
}
long temp=pow(x,y/2,mod);
if(y%2==0){
return (temp*temp)%mod;
}
else{
return (((temp*temp)%mod)*x)%mod;
}
}
static long greatestCommonDivisor (long m, long n){
long x;
long y;
while(m%n != 0){
x = n;
y = m%n;
m = x;
n = y;
}
return n;
}
static void dfs(List<Integer>[] graph, boolean[] used, List<Integer> res, int u,int parent,List<Integer> collection) {
used[u] = true;
Integer uu=new Integer(u);
collection.add(uu);
for (int v : graph[u]){
if (!used[v]){
dfs(graph, used, res, v,u,collection);
}
else if(collection.contains(v)){
System.out.println("Impossible");
System.exit(0);
}
}
collection.remove(uu);
res.add(u);
}
public static List<Integer> topologicalSort(List<Integer>[] graph) {
int n = graph.length;
boolean[] used = new boolean[n];
List<Integer> res = new ArrayList<>();
for (int i = 0; i < n; i++)
if (!used[i])
dfs(graph, used, res, i,-1,new ArrayList<Integer>());
Collections.reverse(res);
return res;
}
}
class LcaSparseTable {
int len;
int[][] up;
int[][] max;
int[] tin;
int[] tout;
int time;
int []lvel;
void dfs(List<Integer>[] tree, int u, int p) {
tin[u] = time++;
lvel[u]=lvel[p]+1;
up[0][u] = p;
if(u!=p)
//max[0][u]=weight(u,p);
for (int i = 1; i < len; i++)
{
up[i][u] = up[i - 1][up[i - 1][u]];
max[i][u]=Math.max(max[i-1][u],max[i-1][up[i-1][u]]);
}
for (int v : tree[u])
if (v != p)
dfs(tree, v, u);
tout[u] = time++;
}
public LcaSparseTable(List<Integer>[] tree, int root) {
int n = tree.length;
len = 1;
while ((1 << len) <= n) ++len;
up = new int[len][n];
max=new int[len][n];
tin = new int[n];
tout = new int[n];
lvel=new int[n];
lvel[root]=0;
dfs(tree, root, root);
}
boolean isParent(int parent, int child) {
return tin[parent] <= tin[child] && tout[child] <= tout[parent];
}
public int lca(int a, int b) {
if (isParent(a, b))
return a;
if (isParent(b, a))
return b;
for (int i = len - 1; i >= 0; i--)
if (!isParent(up[i][a], b))
a = up[i][a];
return up[0][a];
}
public long max(int a,int b){
int lca=lca(a,b);
// System.out.println("LCA "+lca);
long ans=0;
int h=lvel[a]-lvel[lca];
// System.out.println("Height "+h);
int index=0;
while(h!=0){
if(h%2==1){
ans=Math.max(ans,max[index][a]);
a=up[index][a];
}
h/=2;
index++;
}
h=lvel[b]-lvel[lca];
// System.out.println("Height "+h);
index=0;
while(h!=0){
if(h%2==1){
ans=Math.max(ans,max[index][b]);
b=up[index][b];
}
h/=2;
index++;
}
return ans;
}
static void dfs1(List<Integer>[] graph, boolean[] used, List<Integer> res, int u) {
used[u] = true;
for (int v : graph[u])
if (!used[v])
dfs1(graph, used, res, v);
res.add(u);
}
int phi(int n) {
int res = n;
for (int i = 2; i * i <= n; ++i) {
if (n % i == 0) {
while (n % i == 0) {
n /= i;
}
res -= res / i;
}
}
if (n != 1) {
res -= res / n;
}
return res;
}
public static long[][] mulmatrix(long m1[][],long m2[][],long mod){
long ans[][]=new long[m1.length][m2[0].length];
for(int i=0;i<m1.length;i++){
for(int j=0;j<m2[0].length;j++){
for(int k=0;k<m1.length;k++){
ans[i][j]+=(m1[i][k]*m2[k][j]);
ans[i][j]%=mod;
}
}
}
return ans;
}
public static long[][] matrixexpo(long m[][],String n,long mod){
if(n.equals("1")){
return m.clone();
}
if(n.equals("10")){
return mulmatrix(m, m , mod);
}
else{
long temp [][]=matrixexpo(m,n.substring(0,n.length()-1),mod);
temp=mulmatrix(temp, temp, mod);
if(n.charAt(n.length()-1)=='0')return temp;
else return mulmatrix(temp, m,mod);
}
}
public static boolean isCompatible(long x[],long y[]){
for(int i=0;i<x.length-1;i++){
if(x[i]==y[i] && x[i+1]==y[i+1] && x[i]==x[i+1] && y[i]==y[i+1]){
return false;
}
}
return true;
}
long pow(long x,long y,long mod){
if(y<=0){
return 1;
}
if(y==1){
return x%mod;
}
long temp=pow(x,y/2,mod);
if(y%2==0){
return (temp*temp)%mod;
}
else{
return (((temp*temp)%mod)*x)%mod;
}
}
long no_of_primes(long m,long n,long k){
long count=0,i,j;
int primes []=new int[(int)(n-m+2)];
if(m==1) primes[0] = 1;
for(i=2; i<=Math.sqrt(n); i++)
{
j = (m/i); j *= i;
if(j<m)
j+=i;
for(; j<=n; j+=i)
{
if(j!=i)
primes[(int)(j-m)] = 1;
}
}
for(i=0; i<=n-m; i++)
if(primes[(int)i]==0 && (i-1)%k==0)
count++;
return count;
}
}
class SegTree {
int n;
static long constt=Long.parseLong("111111111111111111111111111111",2);
long t[];
long mod=(long)(1000000007);
SegTree(int n,long t[]){
this.n=n;
this.t=t;
build();
}
void build() { // build the tree
for (int i = n - 1; i >= 0; --i){
t[i]=(t[i<<1]&t[i<<1|1]);
}
}
void modify(int p, long value) { // set value at position p
for (t[p += n]=value; p > 1; p >>= 1) t[p>>1] = (t[p]&t[p^1]);
// System.out.println(Arrays.toString(t));
}
long query(int l, int r) { // sum on interval [l, r)
long res=constt;
for (l += n, r += n; l < r; l >>= 1, r >>= 1) {
if ((l&1)!=0) res=res&t[l++];
if ((r&1)!=0) res=res&t[--r];
}
return res;
}
//
//
//
}
class FastScanner
{
private InputStream stream;
private byte[] buf = new byte[8192];
private int curChar;
private int snumChars;
private SpaceCharFilter filter;
public FastScanner(InputStream stream) {
this.stream = stream;
}
public int snext() {
if (snumChars == -1)
throw new InputMismatchException();
if (curChar >= snumChars) {
curChar = 0;
try {
snumChars = stream.read(buf);
} catch (IOException e) {
throw new InputMismatchException();
}
if (snumChars <= 0)
return -1;
}
return buf[curChar++];
}
public int nextInt() {
int c = snext();
while (isSpaceChar(c))
c = snext();
int sgn = 1;
if (c == '-') {
sgn = -1;
c = snext();
}
int res = 0;
do {
if (c < '0' || c > '9')
throw new InputMismatchException();
res *= 10;
res += c - '0';
c = snext();
} while (!isSpaceChar(c));
return res * sgn;
}
public long nextLong() {
int c = snext();
while (isSpaceChar(c))
c = snext();
int sgn = 1;
if (c == '-') {
sgn = -1;
c = snext();
}
long res = 0;
do {
if (c < '0' || c > '9')
throw new InputMismatchException();
res *= 10;
res += c - '0';
c = snext();
} while (!isSpaceChar(c));
return res * sgn;
}
public String readString() {
int c = snext();
while (isSpaceChar(c))
c = snext();
StringBuilder res = new StringBuilder();
do {
res.appendCodePoint(c);
c = snext();
} while (!isSpaceChar(c));
return res.toString();
}
public boolean isSpaceChar(int c) {
if (filter != null)
return filter.isSpaceChar(c);
return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
}
public interface SpaceCharFilter {
public boolean isSpaceChar(int ch);
}
}
class UF {
private int[] parent; // parent[i] = parent of i
private byte[] rank; // rank[i] = rank of subtree rooted at i (never more than 31)
private int count; // number of components
public UF(int N) {
if (N < 0) throw new IllegalArgumentException();
count = N;
parent = new int[N];
rank = new byte[N];
for (int i = 0; i < N; i++) {
parent[i] = i;
rank[i] = 0;
}
}
public int find(int p) {
if (p < 0 || p >= parent.length) throw new IndexOutOfBoundsException();
while (p != parent[p]) {
parent[p] = parent[parent[p]]; // path compression by halving
p = parent[p];
}
return p;
}
public int count() {
return count;
}
public boolean connected(int p, int q) {
return find(p) == find(q);
}
public boolean union(int p, int q) {
int rootP = find(p);
int rootQ = find(q);
if (rootP == rootQ) return false;
// make root of smaller rank point to root of larger rank
if (rank[rootP] < rank[rootQ]) parent[rootP] = rootQ;
else if (rank[rootP] > rank[rootQ]) parent[rootQ] = rootP;
else {
parent[rootQ] = rootP;
rank[rootP]++;
}
count--;
return true;
}
}
class MyScanner {
BufferedReader br;
StringTokenizer st;
public MyScanner() {
br = new BufferedReader(new InputStreamReader(System.in));
}
String next() {
while (st == null || !st.hasMoreElements()) {
try {
st = new StringTokenizer(br.readLine());
} catch (IOException e) {
e.printStackTrace();
}
}
return st.nextToken();
}
int nextInt() {
return Integer.parseInt(next());
}
long nextLong() {
return Long.parseLong(next());
}
double nextDouble() {
return Double.parseDouble(next());
}
String nextLine(){
String str = "";
try {
str = br.readLine();
} catch (IOException e) {
e.printStackTrace();
}
return str;
}
}
Python 3 rep HackerRank Solution
Python 2 rep HackerRank Solution
C rep HackerRank Solution
#include <stdio.h>
#include <stdlib.h>
long long modInverse(long long a,long long mod);
long long dp3[3001][3001],dp4[3001],fac[3001],ifac[3001],iifac[3001][3001];
int main(){
int n,m,i,j,k,l;
long long t2;
scanf("%d%d",&n,&m);
for(i=fac[0]=ifac[0]=1;i<=n;i++){
fac[i]=fac[i-1]*i%m;
ifac[i]=modInverse(fac[i],m);
}
for(i=0;i<=n;i++)
for(j=0;j<=n;j++)
iifac[i][j]=ifac[i]*ifac[j]%m;
for(i=0;i<=n;i++)
dp3[i][0]=1;
for(i=1,dp4[1]=1;i<=(n-1)/2;i++){
for(j=1;j<n;j++)
for(k=1,t2=fac[j]*dp4[i]%m,dp3[i][j]=dp3[i-1][j];k*i<=j;k++,t2=t2*dp4[i]%m){
l=j-k*i;
dp3[i][j]=(dp3[i][j]+t2*iifac[l][k]%m*dp3[i-1][l])%m;
}
dp4[i+1]=dp3[i/2][i]*(i+1)%m*(i+1)%m*ifac[i+1]%m;
}
printf("%lld",dp3[(n-1)/2][n-1]*n%m);
return 0;
}
long long modInverse(long long a,long long mod){
long long b0 = mod, t, q;
long long x0 = 0, x1 = 1;
while (a > 1) {
q = a / mod;
t = mod; mod = a % mod; a = t;
t = x0; x0 = x1 - q * x0; x1 = t;
}
if (x1 < 0) x1 += b0;
return x1;
}
Warmup
Implementation
Strings
Sorting
Search
Graph Theory
Greedy
Dynamic Programming
Constructive Algorithms
Bit Manipulation
Recursion
Game Theory
NP Complete
Debugging
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