i came with the same formula but i didnt get the right result as well can anyone explain please?
Well, then we have another problem with weak test cases.
The second term gives you \sum d_i \mod 10 \mod 3, and you need \sum d_i \mod 3.
yes. thanks for confirming.
Try
4 2 5Hi Akshay,
Thanks for your response. However I see that the number generated by 4 2 5 is 2574. Which is divisible by 3 as per my output, and it is also divisible by 3. Please let me know if I’m wrong somewhere.
Regards,
Ruddra
import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;
import java.util.StringTokenizer;
import java.util.;
import java.io.;class Rextester
{
static class Reader
{
final private int BUFFER_SIZE = 1 << 16;
private DataInputStream din;
private byte[] buffer;
private int bufferPointer, bytesRead;public Reader() { din = new DataInputStream(System.in); buffer = new byte[BUFFER_SIZE]; bufferPointer = bytesRead = 0; } public Reader(String file_name) throws IOException { din = new DataInputStream(new FileInputStream(file_name)); buffer = new byte[BUFFER_SIZE]; bufferPointer = bytesRead = 0; } public String readLine() throws IOException { byte[] buf = new byte[64]; // line length int cnt = 0, c; while ((c = read()) != -1) { if (c == '\n') break; buf[cnt++] = (byte) c; } return new String(buf, 0, cnt); } public int nextInt() throws IOException { int ret = 0; byte c = read(); while (c <= ' ') c = read(); boolean neg = (c == '-'); if (neg) c = read(); do { ret = ret * 10 + c - '0'; } while ((c = read()) >= '0' && c <= '9'); if (neg) return -ret; return ret; } public long nextLong() throws IOException { long ret = 0; byte c = read(); while (c <= ' ') c = read(); boolean neg = (c == '-'); if (neg) c = read(); do { ret = ret * 10 + c - '0'; } while ((c = read()) >= '0' && c <= '9'); if (neg) return -ret; return ret; } public double nextDouble() throws IOException { double ret = 0, div = 1; byte c = read(); while (c <= ' ') c = read(); boolean neg = (c == '-'); if (neg) c = read(); do { ret = ret * 10 + c - '0'; } while ((c = read()) >= '0' && c <= '9'); if (c == '.') { while ((c = read()) >= '0' && c <= '9') { ret += (c - '0') / (div *= 10); } } if (neg) return -ret; return ret; } private void fillBuffer() throws IOException { bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE); if (bytesRead == -1) buffer[0] = -1; } private byte read() throws IOException { if (bufferPointer == bytesRead) fillBuffer(); return buffer[bufferPointer++]; } public void close() throws IOException { if (din == null) return; din.close(); }}
public static void main(String[] args) throws IOException
{
Reader in=new Reader();
int test=in.nextInt();
while(test-- >0){
int k=in.nextInt();
int d0=in.nextInt(), d1=in.nextInt();
String D2=d0+“”+d1+“”+((d0+d1)%10);
//System.out.println(D2);
int d2=Integer.parseInt(D2);
String D3=d2+“”+((d0+d1+d2)%10);
//System.out.println(D3);
int d3=Integer.parseInt(D3);
//check for k<=3
if(k==2){
if((d0+d1)%3==0)
System.out.println(“YES”);
else
System.out.println(“NO”);
}
else if (k==3) {
if((d2)%3==0)
System.out.println(“YES”);
else
System.out.println(“NO”);
}
else if (k==4) {
if((d3)%3==0)
System.out.println(“YES”);
else
System.out.println(“NO”);
}
else if (d3%10==0) {
if(d2%3==0)
System.out.println(“YES”);
else {
System.out.println(“NO”);
}
}
else{
int skip=8+6+2+4;
int skp[]={8, 6, 2, 4};
long sum=d0+d1+d2%10;
//System.out.println(sum);
k=k-4;int index=-1;
if(d3%10==8)
index=0;
if(d3%10==6)
index=1;
if(d3%10==2)
index=2;
if(d3%10==4)
index=3;
int s= k/4;
int m= k%4;
sum= sum+s*skip;
//System.out.println(index);
for(int i=0;i<=m;i++){
sum+=skp[(index)%(skp.length)];
//System.out.println("–> "+sum);
index++;
}
//System.out.println("sum: "+sum);
if(sum%3==0)
System.out.println(“YES”);
else {
System.out.println(“NO”);
}
}
}
}
}
I have no idea why am I getting WA in this. Please help
Can someone help me find a bug in my code. For sample inputs it shows right output and for the other I have tested few using manual calculation. But when I submit it says WA.
codechef.com/viewsolution/31077750
Please help me in checking why it is not working
/* package codechef; // don’t place package name! */
import java.util.;
import java.lang.;
import java.io.*;
/* Name of the class has to be “Main” only if the class is public. */
class CodeChef2
{
public static void main (String[] args) throws java.lang.Exception
{
//your code goes here
Scanner sc=new Scanner(System.in);
/*int i=0;
System.out.println(" “+i);
i=Integer.MAX_VALUE;
System.out.println(” “+i);
long l=Long.MAX_VALUE;
System.out.println(” "+l);
*/
int d0,d1,T;
long k;
T=sc.nextInt();
for(int i=0;i<T;i++)
{
k=sc.nextLong();
d0=sc.nextInt();
d1=sc.nextInt();
int value=0;
//System.out.print(k+ " "+ d0+ " "+ d1);
int left;
int s=d0 + d1;
// System.out.println("S:"+s);
int N=(int)((k-3)/4);
int cycle= ((2*s)%10) + ((4*s)%10) + ((8*s)%10 )+ ((6*s)%10);
// System.out.println("cycle:"+cycle);
if(k==2)
value=d0 + d1;
else
{
value= s + (s) + (cycle*N);
// System.out.println("value before left:"+value);
left=(int)( k-3- 4*N);
// System.out.println("left:"+left);
int p=2;
for(int j=1;j<=left;j++)
{ value+=((p*s)%10);
p=(p*2)%10;
}
}
// System.out.println("Value:"+value);
if(value%3 == 0)
System.out.println("YES");
else
System.out.println("NO");
}
}
}
please help me to solve MULTHREE everything is oke but final answer is WRONG
/* package codechef; // don’t place package name! */
import java.util.;
import java.lang.;
import java.io.*;
/* Name of the class has to be “Main” only if the class is public. */
class CodeChef2
{
public static void main (String[] args) throws java.lang.Exception
{
//your code goes here
Scanner sc=new Scanner(System.in);
/*int i=0;
System.out.println(" “+i);
i=Integer.MAX_VALUE;
System.out.println(” “+i);
long l=Long.MAX_VALUE;
System.out.println(” "+l);
*/
int d0,d1,T;
long k;
T=sc.nextInt();
for(int i=0;i<T;i++)
{
k=sc.nextLong();
d0=sc.nextInt();
d1=sc.nextInt();
int value=0;
//System.out.print(k+ " "+ d0+ " "+ d1);
int left;
int s=d0 + d1;
// System.out.println("S:"+s);
int N=(int)((k-3)/4);
int cycle= ((2*s)%10) + ((4*s)%10) + ((8*s)%10 )+ ((6*s)%10);
// System.out.println("cycle:"+cycle);
if(k==2)
value=d0 + d1;
else
{
value= s + (s) + (cycle*N);
// System.out.println("value before left:"+value);
left=(int)( k-3- 4*N);
// System.out.println("left:"+left);
int p=2;
for(int j=1;j<=left;j++)
{ value+=((p*s)%10);
p=(p*2)%10;
}
}
// System.out.println("Value:"+value);
if(value%3 == 0)
System.out.println("YES");
else
System.out.println("NO");
}
}
}
// Template Begin
#pragma GCC optimize(“O3”)
#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define be begin()
#define en end()
#define le length()
#define sz size()
#define y0 sdkfaslhagaklsldk
#define y1 aasdfasdfasdf
#define yn askfhwqriuperikldjk
#define j1 assdgsdgasghsf
#define tm sdfjahlfasfh
#define lr asgasgash
#define norm asdfasdgasdgsd
#define have adsgagshdshfhds
#define eps 1e-6
#define pi 3.141592653589793
using namespace std;
template inline T gcd(T a, T b) { while(b) b ^= a ^= b ^= a %= b; return a; }
template inline T mod(T x) { if(x < 0) return -x; else return x; }
typedef vector VII;
typedef pair<int, int> PII;
typedef pair<int, PII > PPII;
typedef vector< PPII > VPPII;
typedef vector< PII > VPII;
const int MOD = 1e9 + 7;
const int INF = 1e9;
// Template End
const int MAX = 10;
VPPII adj[MAX];
bool vis[MAX];
int dist[MAX];
int distt[MAX];
int parent[MAX];
//scanf(" %[^\n]s",s);//getline(gets) goes not work when you have to pass test cases because buffer does not take integer while we are inserting string;
int str2int (const string &str) {
stringstream ss(str);
int num;
ss >> num;
return num;
}
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
int t;
cin>>t;
while(t>0,t–)
{
long long k,d0,d1;
cin>>k>>d0>>d1;
long long firsttotal = 2d0+2d1;
long long secondtotal = ((k-3)/4)* 20;
int reminder = (k-3)%4;
int nextSum = firsttotal;
if(reminder > 0)
{
nextSum += nextSum%10;
reminder–;
}
if(reminder > 0)
{
nextSum += nextSum%10;
reminder --;
}
if(reminder > 0)
{
nextSum += nextSum%10;
reminder --;
}
if(reminder > 0)
{
nextSum += nextSum%10;
reminder --;
}
if((nextSum + secondtotal)%3 == 0)
{
cout<<"YES"<<endl;
}else{
cout<<"NO"<<endl;
}
}
}
can anyone tell me why this program giving wrong?
My solution to MULTHREE
I have solved the code mathematically on paper and implemented it on my code. i have used following property of modulo operator:
I have expanded the summation terms and applied the above property, but i am getting WA.
If someone can please help me out debug the issue.
Thanking in advance.
Why am I getting ‘Wrong Answer’?
I ran this code on my IDE, it gave the correct answer for all the test cases.
//The code
#include
#include <math.h>
#include
#include
using namespace std;
int main() {
long long t;
cin>>t;
string output[t];
for(long long i=0;i<t;i++){
int d0,d1;
long long k;
cin>>k>>d0>>d1;
long long sum;
long long sum1=(2*(d0+d1))%10+(4*(d0+d1))%10+(8*(d0+d1))%10+(6*(d0+d1))%10;
long long sum2=d0+d1+((d0+d1)%10)+sum1*((k-3)/4);
long long temp=(k-3)%4;
if(temp==1){
sum=sum2+(2*(d0+d1))%10;
}
else if(temp==2){
sum=sum2+(2*(d0+d1))%10+(4*(d0+d1))%10;
}
else if(temp==3){
sum=sum2+(2*(d0+d1))%10+(4*(d0+d1))%10+(8*(d0+d1))%10;
}
if(sum%3==0){
output[i] ="YES";
}
else{
output[i]="NO";
}
}
for(long long i=0;i<t;i++){
cout<<output[i]<<"\n";
}
return 0;
}
t = int(input()) for xyz in range(t): [n,a,b] = map(int,input().split(' ')) if n==2: if a+b%3==0: print('YES') else: print('NO') else: c = (a+b)%10 arr_sum=0 d=[] for i in range(4): d.append(((2**(i+1))*c)%10) arr_sum+=d[i] digit_sum = a+b+c n-=3 digit_sum += (n//4)*arr_sum left = n%4 for i in range(left): digit_sum+=d[i] if digit_sum%3==0: print('YES') else: print('NO')
This code apparently is not able to handle the case when fourth digit is zero. I added a block to handle such cases and it worked fine. But I couldn’t find out why it doesn’t work in that case. I manually gave test cases where 4th digit is zero and it worked. Help !
Click here for my similar C++ solution
This is the simplest solution i could see after seeing other solutions, i thought but its showing TLE. Can anyone please help ?
//sum is sum of digits
#include <bits/stdc++.h>
using namespace std;
int main() {
// your code goes here
int tests = 0;
cin >> tests;
while(tests--){
long long int K = 0, sum = 0;
int d0 = 0, d1 = 0;
cin >> K >> d0 >> d1;
sum = d0 + d1;
for(int i = 2; i < K; i++){
sum += (sum%10);
}
cout << ((sum%3==0)?"YES":"NO") << endl;
}
return 0;
}
You are missing the case when k=1 and k=2
K=10^12 , a simple for loop is not the efficient algorithm.
try to use cyclic pattern mentioned in editorial
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