#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 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; } constexpr int MAX_N = 200; constexpr int MAX_M = 200; int uf[MAX_M]; int root(int u) { return (uf[u] < 0) ? u : (uf[u] = root(uf[u])); } bool connect(int u, int v) { u = root(u); v = root(v); if (u == v) return false; if (uf[u] > uf[v]) swap(u, v); uf[u] += uf[v]; uf[v] = u; return true; } int N, M; char A[MAX_M][MAX_N][MAX_N + 1]; int esLen; bitset es[6 * MAX_N]; int fs[6 * MAX_N]; pair, int> ps[MAX_M]; int main() { for (; ~scanf("%d%d", &N, &M); ) { for (int i = 0; i < M; ++i) { for (int x = 0; x < N; ++x) { scanf("%s", A[i][x]); } } esLen = 0; for (int x = 0; x < N; ++x) { es[esLen].reset(); for (int y = 0; y < N; ++y) { es[esLen][x * N + y] = true; } ++esLen; } for (int y = 0; y < N; ++y) { es[esLen].reset(); for (int x = 0; x < N; ++x) { es[esLen][x * N + y] = true; } ++esLen; } for (int k = 0; k <= 2 * N - 2; ++k) { es[esLen].reset(); for (int x = 0; x < N; ++x) { const int y = k - x; if (0 <= y && y < N) { es[esLen][x * N + y] = true; } } ++esLen; } for (int k = -(N - 1); k <= N - 1; ++k) { es[esLen].reset(); for (int x = 0; x < N; ++x) { const int y = x - k; if (0 <= y && y < N) { es[esLen][x * N + y] = true; } } ++esLen; } // for(int j=0;j