Skip to main content

codeforces-merge it solution 

#include<bits/stdc++.h>
using namespace std;
int main()
{
 int t;
 cin>>t;
 for(int i=1;i<=t;i++)
 {
  int count[3]={0};
  int n;
  cin>>n;
  for(int j=0;j<n;j++)
  {
   long x;
   cin>>x;
   count[x%3]++;
  }
  int result=count[0];
  int t=min(count[1],count[2]);
  result+=t;
  count[1]-=t;
  count[2]-=t;
  result+=(count[1]+count[2])/3;
  cout<<result<<endl;
 }
 return 0;
}

Comments

Post a Comment

Popular posts from this blog

Finding permutations of a string using recursion

#include<bits/stdc++.h> using namespace std; void print_perm(char str[],int k,int n) {     if(k==n)         cout<<str<<endl;     else     {         for(int i=k;i<n;i++)         {             swap(str[k],str[i]);             print_perm(str,k+1,n);             swap(str[k],str[i]);         }     } } int main() {     char str[20];     cout<<"Enter a string"<<endl;     cin>>str;     print_perm(str,0,strlen(str));     return 0; }
Post a Comment
Read more

Reversing a stack using recursion

#include<bits/stdc++.h> using namespace std; stack<int> s2; void rev(stack<int> s) {     if(!s.empty())     {         int temp=s.top();         s.pop();         s2.push(temp);         rev(s);     } } void display(stack<int> s) {     while(!s.empty())     {         cout<<s.top()<<" ";         s.pop();     }     cout<<endl; } int main() {      stack<int> s;      int n;      cout<<"Enter the number of elements to push onto stack"<<endl;      cin>>n;      for (int i = 0; i < n; ++i)      {       ...
Post a Comment
Read more

Gcd using recursion

#include<iostream> #include<algorithm> using namespace std; int gcd(int m,int n) {     if(max(m,n)%min(m,n)==0)     {         return min(m,n);     }     else     {         gcd(max(m,n)%min(m,n),min(m,n));     } } int main() {     int m,n;     cin>>m>>n;     cout<<gcd(m,n);     return 0; }
Post a Comment
Read more