Compilare: main.cpp: In function 'void DFS(int)': main.cpp:30:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g[node].size(); i++) { ~^~~~~~~~~~~~~~~ main.cpp: In function 'void DFS2(int)': main.cpp:41:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<gt[node].size(); i++) { ~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:74:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<ctc[i].size();j++) ~^~~~~~~~~~~~~~ main.cpp:63:32: 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:64:34: 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:65:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ main.cpp:67:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^