Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:20:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < gr[nod].size (); i++) { ~~^~~~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:30:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d", &p); ^ user.cpp:31:30: 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:33:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d", &dmax[i]); ^ user.cpp:37:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d%d", &x, &y, &cost); ^