Compilare: user.cpp: In function ‘void atasaza_la_arbore(int)’: user.cpp:80:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < graph[x].size();++i){ ^ user.cpp: In function ‘void prim()’: user.cpp:100:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0;j <graph[x].size();++j){ ^ user.cpp: In function ‘void read()’: user.cpp:71:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ",&n); ^ user.cpp: In function ‘int main()’: user.cpp:115:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("apm.in","r",stdin); ^ user.cpp:116:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("apm.out","w",stdout); ^