Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:18:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < v[nod].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:59:25: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&n); ^ main.cpp:61:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&a[i]); ^ main.cpp:63:39: 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,&z); ^