Compilare: user.cpp: In member function ‘bool cmp::operator()(long int, long int)’: user.cpp:24:17: warning: statement has no effect [-Wunused-value] cost[a] > cost[b]; ^ user.cpp:25:5: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘void dijkstra(long int)’: user.cpp:40:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<list[node].size();i++){ ^ user.cpp:52:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<list[node].size();i++){ ^ user.cpp: In function ‘long int getSolution(long int)’: user.cpp:67:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<Edges.size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:85:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dbz.in","r",stdin); ^ user.cpp:86:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dbz.out","w",stdout); ^ user.cpp:88:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld %ld",&n,&m); ^ user.cpp:90:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld %ld %ld",&x,&y,&z); ^