Compilare: user.cpp: In function ‘int main()’: user.cpp:20:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cern.in","r",stdin); ^ user.cpp:21:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cern.out","w",stdout); ^ user.cpp:24:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c%d%d", &pct, &dir, &t); ^ user.cpp:101:15: warning: ‘dif’ may be used uninitialized in this function [-Wmaybe-uninitialized] t-=dif; ^ user.cpp:124:9: warning: ‘a’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(a=='X'){ ^