Compilare: user.cpp: In function ‘void dfs2(int, int)’: user.cpp:63:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < colors[nod].size(); ++i) { ^ user.cpp: In function ‘int main()’: user.cpp:94:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < listnod[i].size() - 1; ++j) ^ user.cpp:78:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &k); ^ user.cpp:80:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &a, &b); ^ user.cpp:85:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &col[i]); ^