Compilare: main.cpp: In function 'void DF(int)': main.cpp:18:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<g[i].size();j++){ ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:29:26: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ main.cpp:32:35: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &x,&y); ^