Compilare: user.cpp: In function ‘void make_per()’: user.cpp:55: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void solve()’: user.cpp:80: warning: unused variable ‘nod’ user.cpp: In function ‘int main()’: user.cpp:108: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:109: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result