Compilare: user.cpp: In function ‘void solve(int, int, LL, setll)’: user.cpp:58:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < edg[nod].size(); i++) ^ user.cpp:64:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < edg[nod].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:75:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("invtree.in", "r", stdin); ^ user.cpp:76:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("invtree.out", "w", stdout); ^ user.cpp:78:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &H); ^ user.cpp:82:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &c); ^