Tekijät

input/code.cpp: In function 'std::vector<int> primes(int)':
input/code.cpp:43:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
     if (n > 2)
     ^~
input/code.cpp:45:5: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
     return ans;
     ^~~~~~
input/code.cpp: In function 'std::vector<int> uprimes(int)':
input/code.cpp:66:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
     if (n > 2)
     ^~
input/code.cpp:68:5: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
     return ans;
     ^~~~~~
input/code.cpp: In function 'int main()':
input/code.cpp:111:9: error: 'bitset' was not declared in this scope
  vector<bitset<100000>> bitsets(primes_under_1k.size());
         ^~~~~~
input/code.cpp:111:9: note: suggested alternative: 'fd_set'
  vector<bitset<100000>> bitsets(primes_under_1k.size());
         ^~~~~~
         fd_set
input/code.cpp...

#include <stdio.h> // include before iostream for faster scanf
#include <iostream>
#include <vector>
#include <string>
#include <map>
#include <unordered_map>
#include <algorithm>
#include <utility>
#include <set>
#include <unordered_set>
#include <cmath>
#include <math.h>
#include <queue>
#include <stdlib.h>
#include <string.h>
#include <sstream>
#include <tuple>
#include <utility>
#include <iomanip>
#include <iterator>

using namespace std;
typedef long long LL;

#define printv(printVec) for (auto printVecIter : (printVec)) cout << printVecIter << " "; cout << endl;

// g++ -Wall -Wshadow -std=c++11 a.cpp && ./a.out


vector<int> primes(int n) {
	vector<int> ans;
    while (n % 2 == 0) {
        ans.push_back(2);
        n = n/2;  
    }
    for (int i = 3; i <= sqrt(n); i = i + 2) {
        while (n % i == 0)  
        {
        	ans.push_back(i);
            n = n/i;  
        }  
    }
    if (n > 2)
    	ans.push_back(n);
   	return ans;
}



vector<int> uprimes(int n) {
	vector<int> ans;
    while (n % 2 == 0) {
    	if ((ans.size() && ans.back() != 2) || ans.size() == 0)
        	ans.push_back(2);
        n = n/2;  
    }
    for (int i = 3; i <= sqrt(n); i = i + 2) {
        while (n % i == 0)  
        {
        	if ((ans.size() && ans.back() != i) || ans.size() == 0)
        		ans.push_back(i);
        	// ans.push_back(i);
            n = n/i;  
        }  
    }
    if (n > 2)
    	ans.push_back(n);
   	return ans;
}


bool isprime(int n) {
	vector<int> ans;
    for (int i = 2; i <= sqrt(n); i = i + 2) {
        if (n % i == 0)  
        {
        	return false;
        }  
    }
    return true;
}

int BITSET_SZ = 100000;

int main() {
	std::ios::sync_with_stdio(false);cin.tie(0);
	int n; cin>>n;
	vector<int> nums;
	vector<int> numcnt(1000001);
	LL ans = 0;
	LL ones = 0;
	for (int i =0;i<n; i++) {
		int nn; cin>>nn;
		if (nn == 1) {
			ones++;
			continue;
		}
		nums.push_back(nn);
	}
	sort(nums.begin(), nums.end());
	ans += ones * nums.size() + ones*(ones-1)/2;
	
	vector<int> primes_under_1k;
	vector<int> prime_to_idx(1000);
	for (int i = 2; i <= 1000; i++) {
		if (isprime(i)) {
			primes_under_1k.push_back(i);
			prime_to_idx[i] = primes_under_1k.size();
		}
	}
	vector<bitset<100000>> bitsets(primes_under_1k.size());

	for (int i = 0; i < nums.size(); i++) {
		auto asd = uprimes(nums[i]);
		bitset<100000> tmp;
		int pi = 0;
		for (; pi < asd.size() && asd[pi] < 1000; pi++) {
			int idx = prime_to_idx[asd[pi]];
			bitsets[idx].set(i);
			tmp |= bitsets[idx];
		}
		int out = tmp.count() - 1;
		for (; pi < asd.size(); pi++) {
			int zxc = asd[pi];
			while (zxc <= 1000000) {
				if (numcnt[zxc]) {
					for (int p : asd) {
						if ((zxc % p)==0) {
							out += numcnt[zxc];
						}
					}
				}
				zxc += asd[pi];
			}
		}
// cout << out << " isout " << nums[i] << " " << ans << endl;
		numcnt[nums[i]]++;
		int add = i-out;
		ans += add;
	}
	cout << ans << endl;


	// cout << test.size() << endl;
	// for (int i =0;i<n;i++) {
	// 	cin>>a[i];
	// 	nums.insert(a[i]);
	// }
	// sort(a.begin(), a.end());
	// LL ans = 0;
	// for (int i=0;i<n;i++) {
	// 	vector<int> ps = primes(a[i]);


	// }
}