Compilare: user.cpp: In function ‘void DFS(int, int)’: user.cpp:9:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(poz[nod]<L[y[nod]].size()) ^ user.cpp:22:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else while(poz[nod]<L[x[nod]].size()) ^ user.cpp:7:13: warning: unused variable ‘i’ [-Wunused-variable] {int i,p; ^ user.cpp: In function ‘int main()’: user.cpp:39:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("domino.in","r",stdin); ^ user.cpp:40:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("domino.out","w",stdout); ^ user.cpp:41:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:43:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] {scanf("%d%d",&x[i],&y[i]); ^