Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:12:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i =0; i < G[x].size(); i++) ^ user.cpp: In function ‘void DFP(int)’: user.cpp:24:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i =0; i < Gt[x].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:52:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < ctc[i].size(); j++) ^ user.cpp:30:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ctc.in", "r", stdin); ^ user.cpp:31:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ctc.out", "w", stdout); ^ user.cpp:32:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n",&N, &M); ^ user.cpp:35:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n", &x, &y); ^