Compilare: user.cpp: In function ‘void solve(int, int, LL, heap)’: user.cpp:57:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < edg[nod].size(); i++) ^ user.cpp:61:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < edg[nod].size(); j++) ^ user.cpp: In function ‘int main()’: user.cpp:70:38: 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:71:40: 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:73:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &H); ^ user.cpp:77:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &c); ^