Compilare: user.cpp: In function ‘int dfs(int)’: user.cpp:42:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < node[nod].v.size(); i ++) ^ user.cpp:60:33: warning: suggest parentheses around comparison in operand of ‘|’ [-Wparentheses] else if(!(node[nod].key < node[n[0]].minKey | node[nod].key >= node[n[0]].maxKey)) ^ user.cpp: In function ‘int main()’: user.cpp:75:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("treap.in", "r", stdin); ^ user.cpp:76:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:79:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n1, &n2); ^ user.cpp:85:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &node[i].key); ^ user.cpp:87:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &node[i].priority); ^