Compilare: user.cpp: In function ‘void DFS(long int)’: user.cpp:56:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long i=0;i<list[nod].size();i++){ ^ user.cpp: In function ‘void precalcLCA()’: user.cpp:67:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long j=0;j<nodes.size();j++) ^ user.cpp: In function ‘void makeTree()’: user.cpp:75:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G.size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:116:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("radiatie.in","r",stdin); ^ user.cpp:117:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("radiatie.out","w",stdout); ^ user.cpp:119:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld %ld %ld",&n,&m,&t); ^ user.cpp:121:55: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld %ld %ld",&tmp.n1,&tmp.n2,&tmp.cost); ^ user.cpp:129:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld %ld",&x,&y); ^