func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MAX_N = 100 * 1000 + 19;   const int MASK = 20;   const int inf = 2e9 + 19;   long long n, m, dp[1 << MASK][MASK + 1];   string s[MAX_N];   int main() {     ios::sync_with_stdio(false), cin.tie(0), cout.tie(0);     cin >> n >> m;     for (int i = 0; i < n; i++) cin >> s[i];     for (int i = 0; i < m; i++) {       long long tmp = 0;       for (int j = 0; j < n; j++) tmp += ((1 << j) * (s[j][i] ==  1 ));       dp[tmp][0]++;     }     for (int i = 1; i <= n; i++) {       for (int j = i; j >= 1; j--) {         for (int mask = 0; mask < (1 << n); mask++)           dp[mask][j] += dp[mask ^ (1 << (i - 1))][j - 1];       }     }     long long ans = inf;     for (int mask = 0; mask < (1 << n); mask++) {       long long sum = 0;       for (long long j = 0; j <= n; j++) sum += dp[mask][j] * min(j, n - j);       ans = min(ans, sum);     }     cout << ans;     return (0);   }   