This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
const int mxn = 2e5+5;
typedef long long ll;
typedef unsigned int ui;
typedef unsigned long long ull;
typedef pair<int,int>pii;
typedef pair<int,pii>piii;
#define sf scanf
#define pf printf
#define input freopen("in.txt","r",stdin)
#define output freopen("out.txt","w",stdout)
#define inf 1e18
#define ff first
#define ss second
#define MP make_pair
#define pb push_back
#define all(v) v.begin(), v.end()
#define printcase(cases) printf("Case %d:", cases);
#define Unique(a) a.erase(unique(a.begin(),a.end()),a.end())
#define FAST ios_base::sync_with_stdio(0);cout.tie(0)
#define endl printf("\n")
#define __lcm(a, b) ((a*b)/__gcd(a, b))
map<string,int>mark;
int vis[mxn];
int in[mxn];
int dir[mxn];
int main()
{
// input;
// output;
int n, m, k;
cin >> n >> m >> k;
vector<bitset<4105> >v;
for(int i = 0; i < n; i++)
{
string s;
cin >> s;
bitset<4105>tmp;
// cout << tmp << '\n';
for(int r = 0; r < m; r++)
{
if(s[r]=='A') tmp[r] = '1';
}
v.push_back(tmp);
}
int ans = -1;
for(int i = 0; i < n; i++)
{
int cnt = 0;
for(int r = 0; r < n; r++)
{
if(i==r) continue;
bitset<4105>tmp = v[i]^v[r];
int x = tmp.count();
if(x==k) cnt++;
else break;
}
if(cnt==n-1)
{
ans = i+1;
break;
}
}
cout << ans << '\n';
return 0;
}
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