Compilare: user.cpp:20:36: warning: overflow in implicit constant conversion [-Woverflow] int n, m, i, j, p ,q, x, y, minu = 9999999999999, nr, sol[NMAX]; ^ user.cpp: In function ‘void DFS(int, int)’: user.cpp:61:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < M[x].size(); ++i) ^ user.cpp: In function ‘void DFS2(int, int)’: user.cpp:87:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < M[x].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:26:44: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d%d", &n, &m, &p, &q);//fin >> n >> m >> p >> q; ^ user.cpp:29:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &x, &y);//fin >> x >> y; ^