#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include using namespace std; using Int = long long; template ostream &operator<<(ostream &os, const pair &a) { return os << "(" << a.first << ", " << a.second << ")"; }; template ostream &operator<<(ostream &os, const vector &as) { const int sz = as.size(); os << "["; for (int i = 0; i < sz; ++i) { if (i >= 256) { os << ", ..."; break; } if (i > 0) { os << ", "; } os << as[i]; } return os << "]"; } template void pv(T a, T b) { for (T i = a; i != b; ++i) cerr << *i << " "; cerr << endl; } template bool chmin(T &t, const T &f) { if (t > f) { t = f; return true; } return false; } template bool chmax(T &t, const T &f) { if (t < f) { t = f; return true; } return false; } #define COLOR(s) ("\x1b[" s "m") int N, M, K; char S[300'010][25]; Int bn[25][25], pie[25]; int main() { for (; ~scanf("%d%d%d", &N, &M, &K); ) { for (int i = 0; i < M; ++i) { scanf("%s", S[i]); } for (int n = 0; n <= N; ++n) { bn[n][0] = bn[n][n] = 1; for (int k = 1; k < n; ++k) { bn[n][k] = bn[n - 1][k - 1] + bn[n - 1][k]; } } for (int n = 0; n <= N; ++n) { pie[n] = (n >= K) ? 1 : 0; for (int k = 0; k < n; ++k) { pie[n] -= bn[n][k] * pie[k]; } } cerr<<"pie = ";pv(pie,pie+(N+1)); vector fs(1 << N, 0); for (int i = 0; i < M; ++i) { int p = 0; for (int e = 0; e < N; ++e) p |= (S[i][e] - '0') << e; ++fs[p]; } for (int e = 0; e < N; ++e) { for (int p = 0; p < 1 << N; ++p) if (!(p & 1 << e)) { fs[p] += fs[p | 1 << e]; } } for (int p = 0; p < 1 << N; ++p) { fs[p] *= pie[__builtin_popcount(p)]; } for (int e = 0; e < N; ++e) { for (int p = 0; p < 1 << N; ++p) if (!(p & 1 << e)) { fs[p | 1 << e] += fs[p]; } } vector mxs(N + 1, 0); for (int p = 0; p < 1 << N; ++p) { chmax(mxs[__builtin_popcount(p)], fs[p]); } cerr<<"mxs = "<