Compilare: user.cpp: In function ‘int main()’: user.cpp:37:33: 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:38:35: 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: In function ‘int c_min(int (*)[20], int, int)’: user.cpp:18:12: warning: ‘c’ may be used uninitialized in this function [-Wmaybe-uninitialized] return c; ^ user.cpp: In function ‘int l_min(int (*)[20], int, int)’: user.cpp:32:12: warning: ‘l’ may be used uninitialized in this function [-Wmaybe-uninitialized] return l; ^ user.cpp: In function ‘int main()’: user.cpp:22:21: warning: ‘l’ may be used uninitialized in this function [-Wmaybe-uninitialized] int mi=INT_MAX, l; ^