Compilare: user.cpp: In function ‘void FirstDFS(int)’: user.cpp:22:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<g[node].size();i++) ^ user.cpp: In function ‘void SecondDFS(int)’: user.cpp:33:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<gt[node].size();i++) ^ user.cpp: In function ‘void Solve(int)’: user.cpp:76:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<g[first].size();j++){ ^ user.cpp: In function ‘int main()’: user.cpp:112:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("network.in","r",stdin); ^ user.cpp:113:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("network.out","w",stdout); ^ user.cpp:116:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:118:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%lf%lf",&a,&b,&p0,&p1); ^