Compilare: user.cpp: In function ‘int main()’: user.cpp:9:13: warning: unused variable ‘m’ [-Wunused-variable] int N , m , i , j ; ^ user.cpp:7:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("noname.in" , "r" , stdin) ; ^ user.cpp:8:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("noname.out" , "w" , stdout) ; ^ user.cpp:10:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d" , &N) ; ^ user.cpp:11:53: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (i = 1 ; i <= N ; i ++)scanf ("%d" , &a[i]) ; ^ user.cpp:12:53: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (i = 1 ; i <= N ; i ++)scanf ("%d" , &b[i]) ; ^ user.cpp:13:14: warning: ‘pb’ may be used uninitialized in this function [-Wmaybe-uninitialized] int pa , pb ; ^ user.cpp:13:9: warning: ‘pa’ may be used uninitialized in this function [-Wmaybe-uninitialized] int pa , pb ; ^