Compilare: user.cpp: In function ‘void dfs1(int)’: user.cpp:16:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<g[nod].size();i++) ~^~~~~~~~~~~~~~ user.cpp: In function ‘void dfs2(int)’: user.cpp:26:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<gt[nod].size();i++) ~^~~~~~~~~~~~~~~ user.cpp: In function ‘void dfs(int)’: user.cpp:32:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nod].size();i++) dfs(v[nod][i]); ~^~~~~~~~~~~~~~ user.cpp:34:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nod].size();i++) ~^~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:78:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<ctc[i].size();j++) ~^~~~~~~~~~~~~~ user.cpp:81:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k1=0;k1<g[nod].size();k1++) ~~^~~~~~~~~~~~~~ user.cpp:56:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dep.in","r",stdin); ^ user.cpp:57:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dep.out","w",stdout); ^ user.cpp:59:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&m,&k); ^ user.cpp:62:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^