Compilare: user.cpp: In function ‘void read()’: user.cpp:27:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n", &R, &C); ^ user.cpp:32:29: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(buffer, 1005, stdin); ^ user.cpp: In function ‘int main()’: user.cpp:120:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("barbar.in", "r", stdin); ^ user.cpp:121:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("barbar.out", "w", stdout); ^ user.cpp: In function ‘int solve()’: user.cpp:114:16: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (sol == -1 && bf(0)) return 0; ^