Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:28:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (z = 0; z < v[x].size(); z++) { ^ user.cpp: In function ‘int main()’: user.cpp:39:8: warning: variable ‘fi’ set but not used [-Wunused-but-set-variable] FILE *fi, *g; ^ user.cpp:39:13: warning: variable ‘g’ set but not used [-Wunused-but-set-variable] FILE *fi, *g; ^ user.cpp:43:6: warning: unused variable ‘i’ [-Wunused-variable] int i, j, k, n, x, y, d; ^ user.cpp:43:12: warning: unused variable ‘k’ [-Wunused-variable] int i, j, k, n, x, y, d; ^ user.cpp:43:24: warning: unused variable ‘d’ [-Wunused-variable] int i, j, k, n, x, y, d; ^ user.cpp:44:7: warning: unused variable ‘c’ [-Wunused-variable] char c; ^ user.cpp:46:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:50:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &y); ^