Compilare: main.cpp: In function 'void dfs(int)': main.cpp:17:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<adc[nod].size();++i) ~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:58:30: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<std::vector<int> >::size_type {aka long unsigned int}' [-Wformat=] printf("%d\n",conx.size()); ^ main.cpp:59:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<conx.size();++j) ~^~~~~~~~~~~~ main.cpp:61:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<conx[j].size();++i) ~^~~~~~~~~~~~~~~ main.cpp:45:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ctc.in","r",stdin); ^ main.cpp:46:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ctc.out","w",stdout); ^ main.cpp:47:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ main.cpp:51:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^