Compilare: user.cpp: In function ‘void read()’: user.cpp:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:40: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘void solve1()’: user.cpp:71: warning: unused variable ‘st’ user.cpp:54: warning: unused variable ‘lung’