Compilare: user.cpp: In function ‘int main()’: user.cpp:7:50: warning: unused variable ‘q’ [-Wunused-variable] register int n , s = 0 , i , k = 0 , j , p , q ; ^ user.cpp:5:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "operatii.in" , "r" , stdin ) ; ^ user.cpp:6:47: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "operatii.out" , "w" , stdout ) ; ^ user.cpp:8:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d", &n ) ; ^ user.cpp:11:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d" , &v[i] ) ; ^