Compilare: user.cpp: In function ‘std::pair<int, int> trie_query(int)’: user.cpp:28:31: warning: unused variable ‘poz’ [-Wunused-variable] int i,nod=1,s=0,put=1<<20,poz,a; ^ user.cpp: In function ‘int main()’: user.cpp:61:15: warning: suggest parentheses around comparison in operand of ‘^’ [-Wparentheses] if(sol<a^aux.first) ^ user.cpp:49:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("xormax.in", "r", stdin); ^ user.cpp:50:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("xormax.out", "w", stdout); ^ user.cpp:51:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:57:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x); ^