Compilare: user.cpp: In function ‘int main()’: user.cpp:7:6: warning: unused variable ‘n’ [-Wunused-variable] int n, s, t, a, cerc; char p; ^ user.cpp:5:30: 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:6:32: 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:8:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c%d%d",&p,&s,&t); ^ user.cpp:772:12: warning: ‘cerc’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(cerc%3==0) cerc=3; ^