Compilare: user.cpp: In function ‘void Organise(long int)’: user.cpp:66:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long i=0;i<list[node].size();i++){ ^ user.cpp: In function ‘void Dfs_A(long int)’: user.cpp:88:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long i=0;i<indA[node].size();i++) indA[node][i] = i; ^ user.cpp: In function ‘void Dfs_B(long int)’: user.cpp:104:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long i=0;i<indB[node].size();i++) indB[node][i] = i; ^ user.cpp: In function ‘long int getFirstADuo(long int, long int, long int)’: user.cpp:54:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:144:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("plimbare3.in","r",stdin); ^ user.cpp:145:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("plimbare3.out","w",stdout); ^ user.cpp:147:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld",&n); ^ user.cpp:149:50: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld %ld",&G[i].first,&G[i].second); ^