Compilare: user.cpp: In function ‘int main()’: user.cpp:33:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<c[c[i][0]].size()&&ok;++j)//elimin fiecare muchie spre nodul aflat la extremitate ^ user.cpp:11:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cezar.in","r",stdin); ^ user.cpp:12:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cezar.out","w",stdout); ^ user.cpp:13:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&k);//numarul de noduri si numarul de muchii pe care vreau sa le elimin ^ user.cpp:16:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&x,&y); ^