Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:18:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<v[nod].size();++i) ^ user.cpp: In function ‘void DF(int)’: user.cpp:30:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i <v1[nod].size();++i) ^ user.cpp: In function ‘void back(int)’: user.cpp:58:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i <v[st[k-1]].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:102:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (cmp[nr].size()>Max) {Max=cmp[nr].size();poz=nr;} ^ user.cpp:84:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("plimbare.in","r",stdin); ^ user.cpp:85:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("plimbare.out","w",stdout); ^ user.cpp:86:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:90:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^