Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:31:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<muchii[nod].size();i++) ^ user.cpp: In function ‘void dfs1(int)’: user.cpp:42:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<mcmp[nod].size();i++) ^ user.cpp: In function ‘void dfs2(int)’: user.cpp:49:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<mcmp[nod].size();i++) ^ user.cpp: In function ‘bool bfs()’: user.cpp:80:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<muchii[nod].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:157:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<muchii[i].size();j++) ^ user.cpp:241:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<ans.size();i++) ^ user.cpp:126:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("plan.in","r",stdin); ^ user.cpp:127:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("plan.out","w",stdout); ^ user.cpp:130:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d",&n,&m); ^ user.cpp:134:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d",&x,&y); ^