Compilare: user.cpp: In function ‘void Euler(long int)’: user.cpp:29:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long i=0;i<list[node].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:54:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<start[G[i].y].size();j++){ ^ user.cpp:63:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(list[i].size() == inCount[i]) continue; ^ user.cpp:65:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(list[i].size() < inCount[i]) list[i].push_back(m); ^ user.cpp:66:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(list[i].size() > inCount[i]) { ^ user.cpp:81:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(bg=1;bg<Ans.size() && Ans[bg] == -1;bg++); ^ user.cpp:42:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tester.in","r",stdin); ^ user.cpp:43:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tester.out","w",stdout); ^ user.cpp:45:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld %ld",&n,&m); ^ user.cpp:49:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld %ld",&G[i].x,&G[i].y); ^