Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:19:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < G[x].size(); i++) ^ user.cpp: In function ‘void DFST(int, int)’: user.cpp:30:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < GT[x].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:61:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < ctc[i].size(); j++) fout << ctc[i][j] << ' '; ^ user.cpp:37:34: 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:40:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d %d", &x, &y); ^