Eroare de compilare: user.cpp: In function ‘void Combinations(int, int, int, int, int)’: user.cpp:39:31: error: ‘memcpy’ was not declared in this scope memcpy(aux, mat, sizeof(mat)); ^ user.cpp: In function ‘void backtracking()’: user.cpp:47:30: error: ‘memcpy’ was not declared in this scope memcpy(aux, mat, sizeof(mat)); ^ user.cpp: In function ‘int main()’: user.cpp:58:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("flip.in", "r", stdin); ^ user.cpp:59:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("flip.out", "w", stdout); ^ user.cpp:60:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &N, &M); ^ user.cpp:63:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &mat[i][j]); ^