Grid

#include<iostream>
#include<queue>
#include<stack>
#include<bitset>

using namespace std;

bitset<3000> mem[3000];

///HOHOOOOOOO UUSI YRITYSSSS @____@


int main(){
    cin.sync_with_stdio(false);
    cin.tie(0);
    int n,m;
    cin>>n>>m;
    
    for(int i=0; i<n; i++){
        string s;
        cin>>s;
        mem[i] = bitset<3000>(s);
        
    }
    
    long long ret = 0;


    for(int i=0; i<n; i++){
        for(int j=0; j<i; j++){
            long long tmp = (mem[i]&mem[j]).count();
            ret+=(tmp*(tmp-1))/2;
        }
    }
    
    cout<<ret<<endl;
    return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED

Test 15

Verdict: ACCEPTED

Test 16

Verdict: ACCEPTED

Test 17

Verdict: ACCEPTED

Test 18

Verdict: ACCEPTED

Test 19

Verdict: ACCEPTED

Test 20

Verdict: ACCEPTED

Test 21

Verdict: ACCEPTED

Test 22

Verdict: ACCEPTED

Test 23

Verdict: ACCEPTED

Test 24

Verdict: ACCEPTED

Test 25

Verdict: ACCEPTED

Test 26

Verdict: ACCEPTED

Test 27

Verdict: ACCEPTED