Compilare: user.cpp: In function ‘int main()’: user.cpp:10:18: warning: unused variable ‘D1’ [-Wunused-variable] char dir , c , D1 , D2; ^~ user.cpp:10:23: warning: unused variable ‘D2’ [-Wunused-variable] char dir , c , D1 , D2; ^~ user.cpp:4:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("vase.in","r",stdin); ^ user.cpp:5:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("vase.out","w",stdout); ^ user.cpp:7:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:12:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld %c ", &nr, &dir); ^ user.cpp:16:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld",&x); ^ user.cpp:17:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("vase.in","r",stdin); ^ user.cpp:18:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:22:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld %c ", &nr,&c); ^ user.cpp:25:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld %c ", &nr,&c); ^ user.cpp:39:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld %c ", &nr, &c); ^ user.cpp:43:10: warning: ‘C2’ may be used uninitialized in this function [-Wmaybe-uninitialized] C2 = C2 + nr/2; ~~~^~~~~~~~~~~ user.cpp:42:10: warning: ‘C1’ may be used uninitialized in this function [-Wmaybe-uninitialized] C1 = C1 + nr/2; ~~~^~~~~~~~~~~