Compilare: user.cpp: In function ‘int main()’: user.cpp:38:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<g[a].size();i++) ^ user.cpp:59:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<g[a].size();i++) ^ user.cpp:24:15: warning: unused variable ‘j’ [-Wunused-variable] int n,m,i,j,a,x,y,nod1,nod2,k=0; ^ user.cpp:22:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("graf.in","r",stdin); ^ user.cpp:23:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("graf.out","w",stdout); ^ user.cpp:25:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&n,&m,&nod1,&nod2); ^ user.cpp:28:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^