Compilare: main.cpp: In function 'void dfs(int)': main.cpp:89:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < neighbors[nod].size(); i++) { ~~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:32:26: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &N); ^ main.cpp:35:37: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &v[i]); ^