Compilare: user.cpp: In function ‘void read()’: user.cpp:20:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("plicuri.in ", "r", stdin); ^ user.cpp:21:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:24:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &v[i].l, &v[i].w); ^ user.cpp: In function ‘int bsearch(int)’: user.cpp:40:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘void write()’: user.cpp:58:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("plicuri.out", "w", stdout); ^