Compilare: main.cpp: In function 'void dfs(int)': main.cpp:18:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nod].size();i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'std::vector<int> solve()': main.cpp:45:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<cycle[poz[i]].size();j++) ~^~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:59:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<B.size();i++) poz[B[i]]=i; ~^~~~~~~~~ main.cpp:60:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<B.size();i++) ~^~~~~~~~~ main.cpp: In function 'std::vector<int> solve()': main.cpp:29:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^ main.cpp: In function 'int main()': main.cpp:54:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("transform2.in","r",stdin); ^ main.cpp:55:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("transform2.out","w",stdout); ^ main.cpp:56:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^