Compilare: user.cpp: In function ‘int main()’: user.cpp:223:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ai.in","r",stdin); ^ user.cpp:224:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ai.out","w",stdout); ^ user.cpp:226:92: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%d%d%d%d%d%d%d%d",&n,&tl,&tc,&s1l,&s1c,&s2l,&s2c,&r1l,&r1c,&r2l,&r2c,&k); ^ user.cpp:229:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&l,&c); ^ user.cpp: In function ‘void marc2(int, int)’: user.cpp:217:24: warning: ‘dc’ may be used uninitialized in this function [-Wmaybe-uninitialized] l-=dl,c-=dc; ^ user.cpp:131:9: warning: ‘dl’ may be used uninitialized in this function [-Wmaybe-uninitialized] int dl,dc; ^