Compilare: user.cpp: In function ‘void Solve()’: user.cpp:28:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[Array[1]].size();i++) ^ user.cpp:46:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<G[Array[i]].size();j++) ^ user.cpp: In function ‘void Read()’: user.cpp:14:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&N,&M); ^ user.cpp:16:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&Array[i]); ^ user.cpp:19:75: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&Matrix[i][j]),G[Matrix[i][j]].push_back((i-1)*N+j); ^ user.cpp: In function ‘int main()’: user.cpp:76:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sarpe2.in","r",stdin); ^ user.cpp:77:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sarpe2.out","w",stdout); ^