Compilare: user.cpp: In function ‘void atasaza_la_arbore(int)’: user.cpp:81:37: 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:101:40: 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:71:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d ",&n,&m); ^ user.cpp:74:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d ",&x,&y,&z); ^ user.cpp: In function ‘int main()’: user.cpp:116:32: 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:117:34: 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); ^