Compilare: user.cpp: In function ‘void FirstDFS(int)’: user.cpp:14:28: 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:24:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<gt[node].size();i++) ^ user.cpp: In function ‘void StronglyConnectedComponents()’: user.cpp:39:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<g[i].size();j++) ^ user.cpp: In function ‘void TopologicalSort(int)’: user.cpp:47:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<dag[node].size();i++) ^ user.cpp: In function ‘void DFS(int, int)’: user.cpp:62:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<dag[node].size();i++) ^ user.cpp: In function ‘void ComputeLowest(int)’: user.cpp:72:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<dag[node].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:108:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("obiective.in","r",stdin); ^ user.cpp:109:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("obiective.out","w",stdout); ^ user.cpp:111:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:113:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a,&b); ^ user.cpp:125:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&queries); ^ user.cpp:127:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a,&b); ^