#pragma GCC target("avx2") #pragma GCC optimize("O3") #pragma GCC optimize("unroll-loops") #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include using namespace std; using namespace atcoder; typedef long long ll; #define rep(i, n) for (int i = 0; i < (int)(n); i++) #define repr(i, n) for (int i = (int)(n)-1; i >= 0; i--) #define repk(i, k, n) for (int i = k; i < (int)(n); i++) #define all(v) v.begin(), v.end() #define mod1 1000000007 #define mod2 998244353 #define mod3 100000007 #define vi vector #define vs vector #define vc vector #define vl vector #define vb vector #define vvi vector> #define vvc vector> #define vvl vector> #define vvb vector> #define vvvi vector>> #define vvvl vector>> #define pii pair #define pil pair #define pli pair #define pll pair #define vpii vector> #define vpll vector> #define vvpii vector>> #define vvpll vector>> using mint = modint998244353; template void debug(T e) { cerr << e << endl; } template void debug(vector &v) { rep(i, v.size()) { cerr << v[i] << " "; } cerr << endl; } template void debug(vector> &v) { rep(i, v.size()) { rep(j, v[i].size()) { cerr << v[i][j] << " "; } cerr << endl; } } template void debug(vector> &v) { rep(i, v.size()) { cerr << v[i].first << " " << v[i].second << endl; } } template void debug(set &st) { for (auto itr = st.begin(); itr != st.end(); itr++) { cerr << *itr << " "; } cerr << endl; } template void debug(multiset &ms) { for (auto itr = ms.begin(); itr != ms.end(); itr++) { cerr << *itr << " "; } cerr << endl; } template void debug(map &mp) { for (auto itr = mp.begin(); itr != mp.end(); itr++) { cerr << itr->first << " " << itr->second << endl; } } void debug_out() { cerr << endl; } template void debug_out(Head H, Tail... T) { cerr << H << " "; debug_out(T...); } double EPS = 0.000000001; int GaussJordan(vector> &A) { int M = A.size(); int N = A[0].size(); int rank = 0; for (int col = 0; col < N; col++) { int pivot = -1; double ma = EPS; for (int row = rank; row < M; row++) { if (abs(A[row][col]) > ma) { ma = abs(A[row][col]); pivot = row; } } if (pivot == -1) { continue; } swap(A[pivot], A[rank]); double fac = A[rank][col]; for (int col2 = 0; col2 < N; col2++) { A[rank][col2] /= fac; } for (int row = 0; row < M; row++) { if (row != rank && abs(A[row][col]) > EPS) { double fac = A[row][col]; for (int col2 = 0; col2 < N; col2++) { A[row][col2] -= A[rank][col2] * fac; } } } rank++; } return rank; } int main() { int L, M, N; cin >> L >> M >> N; vector> A(L, vector(M)); for (int i = 0; i < L; i++) { for (int j = 0; j < M; j++) { cin >> A[i][j]; } } vector> B(M, vector(N)); for (int i = 0; i < M; i++) { for (int j = 0; j < N; j++) { cin >> B[i][j]; } } vector> C(L, vector(N, 0)); for (int i = 0; i < L; i++) { for (int j = 0; j < M; j++) { for (int k = 0; k < N; k++) { C[i][k] += A[i][j] * B[j][k]; } } } // debug(C); bool ans = true; for (int i = 0; i < L; i++) { for (int j = 0; j < N; j++) { if (C[i][j] != 0) { ans = false; } } } vector> dA(L, vector(M)); for (int i = 0; i < L; i++) { for (int j = 0; j < M; j++) { dA[i][j] = (double)A[i][j]; } } vector> dB(M, vector(N)); for (int i = 0; i < M; i++) { for (int j = 0; j < N; j++) { dB[i][j] = (double)B[i][j]; } } // debug(GaussJordan(dB)); // debug(GaussJordan(dA)); if (GaussJordan(dB) != M - GaussJordan(dA)) { ans = false; } if (ans) { cout << "Yes" << endl; } else { cout << "No" << endl; } }