Compilare: user.cpp: In function ‘int main()’: user.cpp:25: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘void solve()’: user.cpp:45: warning: comparison between signed and unsigned integer expressions user.cpp:46: warning: comparison between signed and unsigned integer expressions user.cpp:43: warning: unused variable ‘k’ user.cpp: In function ‘int det()’: user.cpp:80: warning: unused variable ‘d’ user.cpp: In function ‘void pune(double)’: user.cpp:96: warning: comparison between signed and unsigned integer expressions