Compilare: user.cpp: In function ‘int main()’: user.cpp:40:34: warning: NULL used in arithmetic [-Wpointer-arith] for(j = 1; msj[j] != NULL; ++ j) { ^ user.cpp:68:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < sol.size(); ++ i) ^ user.cpp:15:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pentagrame.in", "r", stdin); ^ user.cpp:16:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pentagrame.out", "w", stdout); ^ user.cpp:19:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:21:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n", penta[i] + 1); ^ user.cpp:36:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", msj + 1); ^