Compilare: user.cpp: In function ‘int BF()’: user.cpp:18:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<G[nod].size();j++) { ^ user.cpp: In function ‘int main()’: user.cpp:32:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[N].size();i++) { ^ user.cpp:28:84: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fear.in","r",stdin),freopen("fear.out","w",stdout),scanf("%d%d",&N,&M); ^ user.cpp:28:84: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:28:84: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:30:86: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%lf",&x,&y,&z),C[x][y]+=log(z),G[x].push_back(y),G[y].push_back(x); ^