Need help to convert c++ code to java code main problem occuring in map

1 
#include<bits/stdc++.h>
using namespace std;
const int maxn=1e6+10;
int d[maxn],c[maxn],b[maxn];
int compute_primefactors(int n){
map<int,int>mp;
for(int d=2;d*d<=n;d++){
    while(n%d==0){
        mp[d]++;
        n/=d;
    }
}
if(n>1)
    mp[n]++;
int sum=0;
for(auto it:mp){
    sum+=it.second;
}
return sum;
}
void sum_of_exponents_of_prime_factors_of_x(int n){
for(int i=1;i<n;i++){
    c[i]=compute_primefactors(i);
}
}
void precompute(){
int B_x=maxn;
sum_of_exponents_of_prime_factors_of_x(maxn);
d[1]=c[1];
for(int i=2;i<maxn;i++){
    d[i]=d[i-1]+c[i];
}
}
int main(){
precompute();
int t;
cin>>t;
while(t--){
    int x;
    cin>>x;
    cout<<d[x-1]+c[x];
}
}
2

Can you share your full code along with “input” using an online compiler.