Compilare: user.cpp: In function ‘int main()’: user.cpp:198:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("banda1.in", "r", stdin); ^ user.cpp:199:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("banda1.out", "w", stdout); ^ user.cpp:200:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.cpp:205:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ user.cpp: In function ‘int makeRang(int, int&, int&)’: user.cpp:195:1: warning: control reaches end of non-void function [-Wreturn-type] } ^