Compilare: user.cpp: In member function ‘int Treapuri::RandomGenerator()’: user.cpp:43:23: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] return ((rand()<<15 + rand())%1000000007 + 1000000007)%1000000007 + 1; ^ user.cpp: In function ‘int main(int, const char**)’: user.cpp:238:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("metro.in", "r", stdin); ^ user.cpp:239:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("metro.out", "w", stdout); ^