Compilare: user.cpp: In function ‘int main()’: user.cpp:155:17: warning: variable ‘L’ set but not used [-Wunused-but-set-variable] int L, R, old; ^ user.cpp:177:13: warning: variable ‘L’ set but not used [-Wunused-but-set-variable] int L, R, old; ^ user.cpp: In function ‘void read_and_normalize()’: user.cpp:14:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &N, &M); ^ user.cpp:18:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &a[i]); ^ user.cpp:25:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &b[i]); ^ user.cpp: In function ‘int main()’: user.cpp:90:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("compunere.in", "r", stdin); ^ user.cpp:91:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("compunere.out", "w", stdout); ^