Compilare: user.cpp: In function ‘void Read_it()’: user.cpp:66:17: warning: variable ‘i2’ set but not used [-Wunused-but-set-variable] int i1, j1, i2, j2; ^ user.cpp: In function ‘int main()’: user.cpp:32:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zona.in", "rt", stdin); ^ user.cpp:33:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zona.out", "wt", stdout); ^ user.cpp: In function ‘void Read_it()’: user.cpp:58:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &lp, &cp, &n, &L); ^ user.cpp:71:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &dir); ^