Compilare: main.cpp: In function 'void dfs(int, int, int)': main.cpp:24:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<adj[nod].size();i++) ~^~~~~~~~~~~~~~~~ main.cpp: In function 'void visiteddfs(int)': main.cpp:35:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<adj[nod].size();i++) visiteddfs(adj[nod][i].x); ~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:41:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ciclu.in","r",stdin); ^ main.cpp:42:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ciclu.out","w",stdout); ^