Codeforces Round #421 (Div. 2), problem: (E) Mister B and Beacons on Field Solution In C/C++

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;
import java.util.TreeMap;

/**
* @author Don Li
*/
public class MisterBBeaconsField {

int N = (int) 2e6 + 10;
int SQRT = (int) (Math.sqrt(N) + 0.5);

int[] f = new int[N];
long nn, mm, ss;

long ans;
int[][] fs;
List<Long> bad = new ArrayList<>();

void solve() {
for (int i = 2; i < N; i++) {
if (f[i] == 0) {
f[i] = i;
for (int j = i * i; j < N && i <= SQRT; j += i) f[j] = i;
}
}

int T = in.nextInt();
while (T– > 0) {
int[] n = new int[3], m = new int[3], s = new int[3];
for (int i = 0; i < 3; i++) n[i] = in.nextInt();
for (int i = 0; i < 3; i++) m[i] = in.nextInt();
for (int i = 0; i < 3; i++) s[i] = in.nextInt();

s[0] *= 2;
nn = (long) n[0] * n[1] * n[2];
mm = (long) m[0] * m[1] * m[2];
ss = (long) s[0] * s[1] * s[2];

ans = 0;

fs = primeFactors(s);
dfs(0, 1);

bad.clear();
int[][] fn = primeFactors(n);
for (int i = 0; i < fn.length; i++) {
long v = fn[i][0];
for (int j = 0; j < fn[i][1]; j++) {
if (ss % v != 0) {
bad.add(v);
break;
}
v *= fn[i][0];
}
}
dfs2(0, 1, 0);

out.println(ans);
}
}

// iterate all the divisors of 2*s and count the number of divisors ≤ n
void dfs(int i, long v) {
if (i == fs.length) {
if (v <= nn) ans++;
return;
}
long mul = 1;
for (int j = 0; j <= fs[i][1]; j++) {
dfs(i + 1, v * mul);
mul *= fs[i][0];
}
}

// calc the number of k (such that gcd(n,k) | 2*s and 1≤k≤m) with inclusion-exclusion principle
void dfs2(int i, long v, int cnt) {
if (i == bad.size()) {
if (cnt == 0) ans += mm / v;
else ans -= mm / v;
return;
}
dfs2(i + 1, v, cnt);
dfs2(i + 1, v * bad.get(i), cnt ^ 1);
}

int[][] primeFactors(int[] a) {
TreeMap<Integer, Integer> map = new TreeMap<>();
for (int i = 0; i < 3; i++) {
int x = a[i];
while (x > 1 && x != f[x]) {
map.put(f[x], map.getOrDefault(f[x], 0) + 1);
x /= f[x];
}
if (x > 1) map.put(x, map.getOrDefault(x, 0) + 1);
}

int k = map.keySet().size();
int[][] cnt = new int[k][2];
int p = 0;
for (int x : map.keySet()) {
cnt[p][0] = x;
cnt[p][1] = map.get(x);
p++;
}
return cnt;
}

public static void main(String[] args) {
in = new FastScanner(new BufferedReader(new InputStreamReader(System.in)));
out = new PrintWriter(System.out);
new MisterBBeaconsField().solve();
out.close();
}

static FastScanner in;
static PrintWriter out;

static class FastScanner {
BufferedReader in;
StringTokenizer st;

public FastScanner(BufferedReader in) {
this.in = in;
}

public String nextToken() {
while (st == null || !st.hasMoreTokens()) {
try {
st = new StringTokenizer(in.readLine());
} catch (IOException e) {
e.printStackTrace();
}
}
return st.nextToken();
}

public int nextInt() {
return Integer.parseInt(nextToken());
}

public long nextLong() {
return Long.parseLong(nextToken());
}

public double nextDouble() {
return Double.parseDouble(nextToken());
}
}
}

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;
import java.util.TreeMap;

/**
* @author Don Li
*/
public class MisterBBeaconsField {

int N = (int) 2e6 + 10;
int SQRT = (int) (Math.sqrt(N) + 0.5);

int[] f = new int[N];
long nn, mm, ss;

long ans;
int[][] fs;
List<Long> bad = new ArrayList<>();

void solve() {
for (int i = 2; i < N; i++) {
if (f[i] == 0) {
f[i] = i;
for (int j = i * i; j < N && i <= SQRT; j += i) f[j] = i;
}
}

int T = in.nextInt();
while (T– > 0) {
int[] n = new int[3], m = new int[3], s = new int[3];
for (int i = 0; i < 3; i++) n[i] = in.nextInt();
for (int i = 0; i < 3; i++) m[i] = in.nextInt();
for (int i = 0; i < 3; i++) s[i] = in.nextInt();

s[0] *= 2;
nn = (long) n[0] * n[1] * n[2];
mm = (long) m[0] * m[1] * m[2];
ss = (long) s[0] * s[1] * s[2];

ans = 0;

fs = primeFactors(s);
dfs(0, 1);

bad.clear();
int[][] fn = primeFactors(n);
for (int i = 0; i < fn.length; i++) {
long v = fn[i][0];
for (int j = 0; j < fn[i][1]; j++) {
if (ss % v != 0) {
bad.add(v);
break;
}
v *= fn[i][0];
}
}
dfs2(0, 1, 0);

out.println(ans);
}
}

// iterate all the divisors of 2*s and count the number of divisors ≤ n
void dfs(int i, long v) {
if (i == fs.length) {
if (v <= nn) ans++;
return;
}
long mul = 1;
for (int j = 0; j <= fs[i][1]; j++) {
dfs(i + 1, v * mul);
mul *= fs[i][0];
}
}

// calc the number of k (such that gcd(n,k) | 2*s and 1≤k≤m) with inclusion-exclusion principle
void dfs2(int i, long v, int cnt) {
if (i == bad.size()) {
if (cnt == 0) ans += mm / v;
else ans -= mm / v;
return;
}
dfs2(i + 1, v, cnt);
dfs2(i + 1, v * bad.get(i), cnt ^ 1);
}

int[][] primeFactors(int[] a) {
TreeMap<Integer, Integer> map = new TreeMap<>();
for (int i = 0; i < 3; i++) {
int x = a[i];
while (x > 1 && x != f[x]) {
map.put(f[x], map.getOrDefault(f[x], 0) + 1);
x /= f[x];
}
if (x > 1) map.put(x, map.getOrDefault(x, 0) + 1);
}

int k = map.keySet().size();
int[][] cnt = new int[k][2];
int p = 0;
for (int x : map.keySet()) {
cnt[p][0] = x;
cnt[p][1] = map.get(x);
p++;
}
return cnt;
}

public static void main(String[] args) {
in = new FastScanner(new BufferedReader(new InputStreamReader(System.in)));
out = new PrintWriter(System.out);
new MisterBBeaconsField().solve();
out.close();
}

static FastScanner in;
static PrintWriter out;

static class FastScanner {
BufferedReader in;
StringTokenizer st;

public FastScanner(BufferedReader in) {
this.in = in;
}

public String nextToken() {
while (st == null || !st.hasMoreTokens()) {
try {
st = new StringTokenizer(in.readLine());
} catch (IOException e) {
e.printStackTrace();
}
}
return st.nextToken();
}

public int nextInt() {
return Integer.parseInt(nextToken());
}

public long nextLong() {
return Long.parseLong(nextToken());
}

public double nextDouble() {
return Double.parseDouble(nextToken());
}
}
}

More from author

LEAVE A REPLY

Please enter your comment!
Please enter your name here

Related posts

Advertismentspot_img

Latest posts

Why Home Office Lighting Is Currently Breaking the Internet

📢 As an Amazon Associate, I earn from qualifying purchases.There comes a point when you realise that tolerating a frustrating situation is costing you...

What does rat scat look like?

Discovering unwanted pests in your living space is a homeowner's worst nightmare. Among the clearest signals of a rodent problem is finding fecal matter...

How to Use Snail Mucin Essence on Face (Complete Beginner’s Guide)

Overview: How to Use Snail Mucin Essence on Face (Complete Beginner's Guide) Finding reliable, data-backed guidance on how to use snail mucin essence on face...

Want to stay up to date with the latest news?

We would love to hear from you! Please fill in your details and we will stay in touch. It's that simple!