Compilare: user.cpp: In function ‘void APM(int)’: user.cpp:35:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[aux.x].size();++i) ^ user.cpp:50:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[aux.y].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:78:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[1].size();++i) ^ user.cpp:89:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<SUB.size();++i) ^ user.cpp:69:32: 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:70:34: 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); ^ user.cpp:71:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^ user.cpp:74:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&x,&y,&cost); ^