Compilare: user.cpp: In function ‘int main()’: user.cpp:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘int rezolva()’: user.cpp:41: warning: control reaches end of non-void function user.cpp:11: warning: ‘semn’ may be used uninitialized in this function