Compilare: user.cpp: In function ‘int main()’: user.cpp:64:13: warning: unused variable ‘k’ [-Wunused-variable] int k = 0 ; ^ user.cpp:31:17: warning: unused variable ‘o’ [-Wunused-variable] int n , m , o = 1 ; ^ user.cpp:29:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("alee.in" , "r" , stdin) ; ^ user.cpp:30:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("alee.out" , "w" , stdout) ; ^ user.cpp:32:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d" , &n) ; ^ user.cpp:33:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d" , &m) ; ^ user.cpp:37:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d" , &p1 , &p2) ; ^ user.cpp:45:48: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d%d%d" , &s1 , &s2 , &p1 , &p2) ; ^