Compilare: user.cpp: In function ‘void SCANF(int&)’: user.cpp:18:29: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] while ('0'<=buffer[BP] && buffer[BP]<='9' || buffer[BP] == '-') ^ user.cpp: In function ‘Node& Merge(const Node&, const Node&)’: user.cpp:103:10: warning: reference to local variable ‘sol’ returned [-Wreturn-local-addr] Node sol; ^ user.cpp: In function ‘void SCANF(int&)’: user.cpp:17:45: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer,1,BS,stdin),BP=0; ^ user.cpp:25:42: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer,1,BS,stdin),BP=0; ^ user.cpp: In function ‘int main()’: user.cpp:176:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("maxq.in", "r", stdin); ^ user.cpp:177:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("maxq.out", "w", stdout); ^