Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:25:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<a[nod].size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:75:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<ctc[i].size()-1; j++) ^ user.cpp:56:33: 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:58:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &x, &y); ^