Compilare: user.cpp: In function ‘void caut()’: user.cpp:21:26: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable] int st = 0, dr = S1, ret = S1; ^ user.cpp: In function ‘int main()’: user.cpp:42:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sir7.in","r",stdin); ^ user.cpp:43:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sir7.out","w",stdout); ^ user.cpp:45:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&T); ^ user.cpp:47:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%lld",&N,&S1,&S2); ^