Compilare: main.cpp: In function 'void dfs(int)': main.cpp:14:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<G[u].size(); j++) { ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:70:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<deafisat.size()-1; i++) ~^~~~~~~~~~~~~~~~~~ main.cpp:31:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ciclueuler.in","r",stdin); ^ main.cpp:32:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ciclueuler.out","w",stdout); ^ main.cpp:34:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ main.cpp:36:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a,&b); ^