Eroare de compilare: user.cpp: In function ‘double solve()’: user.cpp:67: error: ‘r’ was not declared in this scope user.cpp:64: warning: unused variable ‘p’ user.cpp: In function ‘int main()’: user.cpp:78: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:79: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:80: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result user.cpp:86: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result