Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:16:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[nod].size(); ++i) { ^ user.cpp:24:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[nod].size(); ++i) ^ user.cpp: In function ‘void dfs2(int)’: user.cpp:40:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < copii[nod].size(); ++j) { ^ user.cpp: In function ‘int main()’: user.cpp:52:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &n, &m); ^ user.cpp:54:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &x, &y); ^ user.cpp: In function ‘void dfs(int)’: user.cpp:29:64: warning: ‘tin’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(fout, "%d %d\n", tin + 1, v[nod][i] + 1); ^