Compilare: user.cpp: In function ‘int main()’: user.cpp:15:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("text3.in","r",stdin); ^ user.cpp:16:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("text3.out","w",stdout); ^ user.cpp: At global scope: user.cpp:11:29: warning: ‘v’ defined but not used [-Wunused-variable] struct {char x, y; int z;} v[DIM * 100 + 1]; ^ /tmp/ccYLiHsy.o: In function `main': user.cpp:(.text.startup+0x58): warning: the `gets' function is dangerous and should not be used.