Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:22:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < VECT[nod].size(); ++i) ^ user.cpp:26:7: warning: unused variable ‘cost’ [-Wunused-variable] int cost = VECT[nod][i].ss.ss; ^ user.cpp:32:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < VECT[nod].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:52:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arb2.in","r",stdin); ^ user.cpp:53:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arb2.out","w",stdout); ^ user.cpp:54:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&N); ^ user.cpp:58:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d\n",&x,&y,&dist,&cost); ^