Compilare: user.cpp: In function ‘bool cond(int)’: user.cpp:43:48: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] || aux[pos[node][1]].y == node && aux[pos[node][2]].y == node); ^ user.cpp: In function ‘void construct()’: user.cpp:19:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.cpp:21:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &biperm[j].x); ^ user.cpp:27:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &biperm[j].y); ^